When a predator always eats huge numbers of a single prey, the two species are strongly linked.
一种掠食动物经常大量捕食单单一种猎物时，这两个物种是紧密联系的。
Two species of deer have been prevalent in the Puget Sound area of Washington State in the Pacific Northwest of the United States.
在太平洋西北部的美国华盛顿州的普吉特海湾地区，有两种常见的鹿。
The two species effectively team up to break down young rice plants for their nutrients, causing a plant disease known as rice seedling blight.
这两个物种有效地合作，来分解水稻的幼苗作为它们的营养来源，造成一种叫水稻立枯病的植物病害。
The new methods infer the closeness of any two species' relationship to each other directly from similarities between the species' genetic codes.
新的方法直接从两个物种的遗传密码之间的相似性推断出任何两个物种之间关系的密切程度。
Given the extraordinary diversity of life on the planet, there must be mechanisms for speciation: the formation of two species from one original species.
考虑到地球上的生命的非凡多样性，一定存在着形成物种的机制：从一个原始物种演变为两个物种。
Caloric-restriction projects underway in two species more closely related to humans—rhesus and squirrel monkeys—have made scientists optimistic that CR mimetics could help people.
对与人类联系更密切的两个物种——猕猴和松鼠猴——进行热量限制的项目，使科学家对模拟热量限制可以帮助人类抱有乐观的态度。
On the basis of these experiments and of field observations, the so-called law of competitive exclusion was formulated, according to which no two species can occupy the same niche.
在这些实验和实地观测的基础上，人们制定了所谓的竞争排斥定律，根据该定律，没有两个物种可以占据相同的生态龛。
Mr. Bush even recently traveled to the Chesapeake Bay to announce federal protection for two species of fish, the striped bass and the red drum.
布什先生最近甚至来到切萨皮克湾宣布联邦政府将保护两种鱼类，条纹鲈鱼和红鼓鱼。
那么现在我们有两种气体。
I've got two species to end with.
结束时也有两种物质。
Two species enter ... One species leaves.
两个物种进去……一个物种存活。
Second order. There are two species here.
第二级，有两种物质。
How would the two species deal with each other?
这两种不同类的生物会如何对待彼此呢？
Twenty-two species of bat are known to be tentmakers.
已知二十二种蝙蝠是帐篷制造者。
How the relationship between the two species originated is unknown.
这两种物种之间的合作关系是如何起源的还是个未知数。
The two species are thought to have split over one million years ago.
他们认为这两个物种是在100多万年前分化出来的。
The latter two species are not considered edible, at least not directly.
其中后两种昆虫不适合食用，至少不能用来直接食用。
The scientific term for an animal with mingled cells from two species is chimera.
由两个物种的细胞混合而诞生的动物，其科学术语唤作嵌合体。
But even to the trained eye, two species of earthworms can be tough to tell apart.
可是，即使是受过训练的眼睛，也可能很难把两种蚯蚓分辨开。
And we have two species reacting to form another species, or bimolecular stuff, et cetera.
我们有两种物质反应生成另外的物质，或双分子的物质，等等。
Here’s one example. There are two species of orchids that live very close together in South Africa.
在南非有两种兰花，它们生长在同一片区域。
The debate over whether the African elephant is one or two species has been going on for about a decade.
关于非洲象是一个还是两个物种的争论已经持续了差不多十年。
Over all, the genomes of the two species are very similar and differ in less than 1 percent of their DNA.
总体上，两个物种的基因组是相似的，除了有低于1％的DNA差异；
The hybridization of mammoths may explain other fossils that look like intermediates between the two species.
混血猛犸可能解释其它看起来介于两个物种之间的化石。
It turns out that these large behavioural differences between the two species are caused by small genetic ones.
事实证明以上两种田鼠行为上的巨大差异是由基因上的小小差别造成的。
Two species, the Scimitar-horned oryx and pere David's deer are extinct in the wild, and only live on in captivity.
还有两个物种，弯角剑羚和麋鹿(外国人叫它神甫大卫鹿)在野外已经灭绝，只有人工圈养的还存活着。
Genetic researchers may have resolved a long-standing dispute by proving there are two species of African elephant.
遗传学研究人士证明非洲象是两个物种，从而可能解决一个长期存在的争论。
There, two species of ants — Argentine and fire — are preparing to duke it out for the state’s 164, 000 square miles.
在那，两种不同的蚂蚁——阿根廷蚁和火蚁——正准备抢夺这个州164000平方英里的土地而打个你死我活。
The pink form, says Gentile, should be considered a third species, and is evolutionarily older than the other two species.
金泰尔说，我们应该把粉红色类型看作第三个物种，而且它比其它两个物种更早进化。
In fact, almost a third of the shared genes (each of which is several thousand letters long) are identical in the two species.
实际上，在人类和黑猩猩中，几乎有三分之一的共有基因（每个基因由数千个遗传符号组成）是完全一致的。
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