你能想出两种动物自我保护的方式吗？
Can you think of the ways in which two animals protect themselves?
同时比较了两种动物试验模型的方法。
这两种动物看起来完全正常。
研究人员发现，这两种动物中，年轻的更喜欢分享。
Young animals of both species were good at sharing, the researchers found.
能够登山金字塔顶端的只有两种动物：鹰和蜗牛。
There are only two creatures, who can surmount the Pyramids, the eagle, and the snail.
这个动物园里有两种狮子。
假设某种动物有一个实现两种不同功能的基因。
Suppose an animal has a gene that carries out two different functions.
时至今日，这两种体型中等的动物始终被认为是同一种生物。
Until now, the two midsize animals were thought to be the same species.
在家里，我又与那两种讨厌的动物天天见面了。
要搞明白集约化肉用动物农场生产、传播病毒是怎么回事的，你得比较两种不同的农场。
To understand how this happens, you have to compare two farms.
它们是世界上唯一的两种产卵的哺乳动物。
动物习语在英汉两种语言中的出现频率都很高。
There are a lot of animal idioms in both English and Chinese.
冬季给野生动物两种选择：离去或者忍耐。
Winter gives wildlife two basic choices: leave or tough it out.
英文中的绵羊(sheep)和山羊(goat)分别是两种完全不同的动物名称，不易混淆。
In English, sheep and goat are distinct names of different species, not easily confused.
方法选用两种疼痛动物模型进行实验研究。
Methods in the experiment, we choose two kinds of animal models to do the research.
方法选用两种疼痛动物模型进行实验研究。
Methods in the experiment, we choose two kinds of animal models to do the research.
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