These pictures show young readers what led Darwin to form his great discovery: the evolution of species through natural selection.

VOA: special.2009.02.27

What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

麻省理工公开课 - 固态化学导论课程节选

And in fact, Skinner explicitly made the analogy from the natural selection of species to the natural selection of behavior.

实际上，斯金纳也确实明确地,对物种的自然选择,同行为的自然选择进行过类比。

耶鲁公开课 - 心理学导论课程节选

They are home to millions of species of sea life that depend on coral reefs for their survival.

VOA: special.2010.08.10

Because only atomic hydrogen has that set of lines which means I could then take the spectra of gas phase species and use that information to identify.

我在这抬头看看然后离开，那就是氢原子,那就意味着,我可以测定,气相种类的光谱并且运用那个信息来鉴定。

麻省理工公开课 - 固态化学导论课程节选

The state wants to remove millions of carp to protect an endangered species native only to Utah Lake, the June sucker fish.

VOA: special.2009.12.15

While other species," he notes, "may have voice, may have sounds and be able to distinguish pleasure and pain, Logos speech"--logos is his word for it.

他注明，“虽然其它动物也许能发声,也许有音调能区分出愉悦与痛苦，“辩论能力“或他所用的词汇。

耶鲁公开课 - 政治哲学导论课程节选

Progress in science and technology is leading to the identification of even more species of coral each year.

VOA: special.2010.08.10

In comes the prehensile thumb, and the next thing you know you get a colossal earthquake, and the possessor of the prehensile thumb disappears from the earth -which is to say, very possibly the human species will never develop.

就像对人类进化至关重要的大拇指，经历了一场大地震后，如果所有有这种拇指的人都消失了,那么人类就很可能永远不能进化。

耶鲁公开课 - 文学理论导论课程节选

Their ancient languages contain a great deal of information about environmental systems and species of plants and animals that are unknown to scientists.

VOA: special.2009.12.02

Then we got into more deliberate hunting of animals, larger species were hunted and then you started to see humans eating things like mammoth, deer, horse, bison, and reindeer.

我们开始有意识地狩猎捕食,我们开始捕杀巨大的物种,于是你能发现人类食用大型动物,比如猛犸象,鹿,马,野牛及驯鹿

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

His team used a method called transient gene silencing to change the genetic structure of the three mosquito species responsible for spreading malaria.

VOA: special.2010.04.20

You have to be able to get the DNA into the cell, it has to be incorporated into a vector of some sort, and the vector has to be compatible with the species and the cells that you've provided the DNA to.

你必须把整合在,某种特定载体上的DNA导入细胞,载体也必须和,受体物种,及细胞匹配

耶鲁公开课 - 生物医学工程探索课程节选

Instead,it belonged to a tyrannosaurid species that lived many millions of years before its T.Rex relative.

VOA: special.2009.10.13

There has never been a regime in history that was so single-mindedly devoted to the end of producing that rarest and most difficult species of humanity called simply philosopher.

历史上从没有一个政体,会如此专一地致力于,催生最稀有,最难得的人类物种,即哲学家。

耶鲁公开课 - 政治哲学导论课程节选

The team found the islands and nearby waters are home to more than 1,200 known species.

VOA: special.2009.01.13

Several large animal species had disappeared so people had to find other animals and so this changed from going to find animals to domesticating animals, and shift from collection of plants to production of plants.

很多大型动物物种已经灭绝了,人类不得不去寻找其他动物,因此这也就完成了从狩猎到驯养的转变,从采集到种植的飞跃

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Scientists have found a new species of blind lobster and giant bacteria, to name a few.

VOA: special.2009.01.13

The goal of such programs is to later place the species back into the wild.

VOA: special.2009.11.18

Xenopus tropicalis is one of twenty frog species native to Africa, south of the Sahara.

VOA: special.2010.06.29

It warns of the possible collapse of fish species important to the commercial food supply.

VOA: special.2010.05.25

In all, researchers say they hope to find examples of 230,000 species during the census.

VOA: special.2009.01.13

It is important to remember that many of the greatest biological discoveries had yet to be made when Darwin published "On the Origin of Species."

VOA: special.2009.12.01

Also,the loss of habitat to development and agriculture continue to endanger many rare species.

VOA: special.2009.05.12

Darwin noted that all these species were similar to those found in South America.

VOA: special.2009.02.25

The scientists said that about half of the coral species were new to them.

VOA: special.2010.08.10

The Everglades is also home to forty species of mammals and fifty reptile species.

VOA: special.2009.06.30

The species they found were compared to information gathered over the past century.

VOA: special.2009.01.13

The goal of the project is to raise awareness about the species that are disappearing and to tell people what can be done to help the situation.

VOA: special.2010.04.21

The Everglades is home to thirty-six species that are considered threatened or protected.

VOA: special.2009.06.30