1.关于科普知识的英语作文200字

As we know, Air pllution is bad for our health.We have very

serious air pollution around, became the main environment problems in

our city.Air pollution has seriously affected our lives.

In order

to protect the air environment in the city, to protect our health,We

must do the following.First of all,We can use clean fuel When we drive

or take the bus.Of course,We can also ride a bicycle to replace

them.Second,We have to plant more trees, let us more fresh air.Of

course, there are many ways to protect environment.

I believe, as long as we all work together,We'll have a clean their homes.

2.科普英语的内容

暗银河系的发现及其科学意义 In addition to conventional galaxies, the universe contains very dim galaxies that until recently went unnoticed by astronomers. Possibly as numerous as conventional galaxies, these galaxies have the same general shape and even the same approximate number of stars as a common type of conventional galaxy, the spiral, but tend to be much larger. Because these galaxies 'mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies. Apparently these low-surface-brightness galaxies, as they are called, take much longer than conventional galaxies to condense their primordial gas and convert it to stars—that is, they evolve much more slowly. These galaxies may constitute an answer to the long-standing puzzle of the missingbaryonic mass in the universe. Baryons—subatomic particles亚原子粒子 that are generally protons or neutrons—are the source of stellar, and therefore galactic, luminosity, and so their numbers can be estimated based on how luminous galaxies are. However, the amount of helium in the universe, as measured by spectroscopy光谱学， suggests that there are far more baryons in the universe than estimates based on galactic luminosity indicate. Astronomers have long speculated that the missing baryonic mass might eventuallybe discovered in intergalactic space星系际的空间 or as some large population of galaxies that are difficult to detect. -------------------------------另类海豹哺乳方式与众不同 Until recently, zoologists believed that all species of phocids (true seals), a pinnipped family, use a different maternal strategy than do otariids (fur seals andsea lions), another pinniped family. Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lactation (milk production) period, which lasts from 4 months to 3 years depending on the species, mother otariids alternately forage at sea, where they replenish their fat stores, and nurse their young at breeding sites. Zoologists had assumed that females of all phocids species, by contrast,use a fasting strategy in which mother phocids, having accumulated large energy stores before they arrive at breeding sites, fast throughout the entire lactation period, which lasts from 4 to 50 days depending on the species. However, recent studies onharbor seals, a phocids species, found that lactating females commenced foragingapproximately 6 days after giving birth and on average made 7 foraging trips during the remainder of their 24-day lactation period. The maternal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lactation. Harbor seals are small compared with other phocids species such as grey seals, all of which are known to fast for the entire lactation period. Studies show that mother seals of these species use respectively 84 percent, 58 percent, and 33 percent of their fat stores during lactation. By comparison, harbor seals use 80 percent of their fat stores in just the first 19 days of lactation, even though they occasionally feed during this period. Since such a large proportion of their fat stores is exhausted despite feeding, mother harbor seals clearly cannot support all of lactation using only energy stored before giving birth. Though smallerthan many other phocids, harbor seals are similar in size to most otariids. In addition,there is already some evidence suggesting that the ringed seal, a phocids species thatis similar in size to the harbor seal, may also use a maternal foraging strategy.------------------------------pheromones是什么东东，是不是该划为odorantThere is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify that the response to pheromones must be unconscious. In addition, the distinctionbetween pheromones and odorants—chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as atype of odorant. Evidence that pheromone responses may not involve conscious odor perception comes from the finding that in many species, pheromones are processed by the vomeronasal (or accessory olfactory) system, which uses a special structure in the nose, the vomeronasal organ (VNO),。

3.关于科普知识的英语作文200字

As we know, Air pllution is bad for our health.We have very

serious air pollution around, became the main environment problems in

our city.Air pollution has seriously affected our lives.

In order

to protect the air environment in the city, to protect our health,We

must do the following.First of all,We can use clean fuel When we drive

or take the bus.Of course,We can also ride a bicycle to replace

them.Second,We have to plant more trees, let us more fresh air.Of

course, there are many ways to protect environment.

I believe, as long as we all work together,We'll have a clean their homes.

4.有关科学的说明文英语

The above web got tons of essays about environment protection!So check it out.PROTECTION OF THE ENVIRONMENT Nowadays protection of the environment is very important as the world is moving into a new era without considering any of the major problems of pollution with rapid industrialization.The best way to protect the environment is conservation.Conservation is the philosophy and policy of managing the environment to assure adequate supplies of natural resources for future as well as present generations.有关科学的说明文英语 Tropical forests are being destroyed at an ever-increasing rate.Estimates of the extent and rate of loss vary,but it appears that nearly half of the world?s tropical forests already have been lost,and the remainder will all but disappear in the next two to three decades.The loss is incalculable.These forests provide habitat for an estimated half of the world?s plant and animal species,provide water and fuel for much of the world?s population,and influence regional and global climate.Commercial logging,clearance for agriculture,The primary conservation concern here is with fossil fuels.Solutions include improvement in the efficiency of fuel combustion,as well as more intensive explorations of alternatives,particularly from solar energy and other renewable resources.1.The maintenance of essential ecological processes (which rain from the global cycles of nitrogen,carbon dioxide,and water to the localized regeneration of soil,recycling of nutrients and cleansing of waters and air) and life support systems,such as agricultural systems,coastal and fresh water systems,and forests.ranching,and fuel gathering are all responsible for the destruction.Their greatest threat is acid rain pollution,which is already severely affecting large areas of the conifer forests of northeast North America and Europe.Solutions include the development of alternative fuel wood supplies through fuel wood plantations,the regulation of logging,and a consensus as to the value of f。

5.用英文表达定义自然科学和社会科学,及两者的关系

natural science,social sicence,the relationship of natural and social sicence

natural science

n.

A science, such as biology, chemistry, or physics, that deals with the objects, phenomena, or laws of nature and the physical world.

social science

n.

1. The study of human society and of individual relationships in and to society.

2. A scholarly or scientific discipline that deals with such study, generally regarded as including sociology, psychology, anthropology, economics, political science, and history.