蝙蝠是有用的动物吗？
牛是有用的动物。
Camels and horses are very useful animals.
骆驼和马是有用的动物。
All of this helps us understand how useful animals can be.
所有这些都有助于我们理解动物是多么有用。
马是有效的动物。
狗是种有用的动物。
Camels are very useful animals in the desert.
骆驼是沙漠中十分有用的动物。
JACK ago was afraid of snakes, but yesterday he read a book on snakes. He learned about the many things on the snake, a snake that is a very useful animals. Now he began like a snake.
JACK以前很害怕蛇，但他昨天看了一本有关蛇的书。他了解了许多关于蛇的东西，知道了蛇是一种非常有益的动物。现在他开始喜欢蛇了。
This ability is useful to animals in lots of ways.
这种能力在很多方面对动物都很有用。
And a dog genome sequence has made the animals an even more useful model by quickening the search for disease-causing genes.
狗的基因组序列能帮助研究人员更快的找到引起人类疾病的基因，因而这种动物是比较有用的疾病模型。
Comparing the intelligence of animals of different species is difficult although there are certain tests and problem sets that have proved to be useful.
比较不同种类的动物之间的智商是一件很困难的事情，虽然有某些测试和问题设置已经证明了很有用。
When conducting drug testing on laboratory mice, it's often useful to image the internal organs of the animals in detail.
对小鼠进行药物测试时，实现精细的内部器官成像常常很有帮助。
If it is useful, why don't all animals do it - and all humans too?
如果这种行为是有益的，为什么它不在动物界和人类社会中普遍存在呢？
Horns are very useful weapons for some animals.
对某些动物来说，角是非常有用的武器。
It's not only broaden our horizon, but also give us a lot of useful knowledge about animals and plants.
这不仅仅开阔了我的眼界，也教会我们很多关于动物和植物的知识。
The guanaco is the tallest of the South American camel-like animals. The hair of a guanaco is too stiff to be useful.
南美野生羊驼是南美洲类似骆驼的动物中最高的动物。南美野生羊驼的毛太硬，没有用处。
They point out that no one can be sure that the future of these plants and animals which may be useful to us.
他们指出，没有人有把握知道这些动植物的哪一种将来可能对我们有用。
They point out that no one is sure to know which kind of animals is likely to be useful to us in the future.
他们指出，没有人有把握知道这些动植物的哪一种将来可能对我们有用。
The earthworm is a useful animal. On the ground it is food for other animals. Under the ground, it makes rich soil for fields and gardens.
蚯蚓是一种有益的动物。在地面上它是其他动物的食物。在地下，它为田野和花园制造肥沃的土壤。
Sea cucumbers can move, but other useful plants or animals may be stuck in the mud.
海参可以移动，但其他有用的植物或动物可能会陷在泥浆里。
Mice, rabbits and other animals have long sensitive hairs on their faces. They are very useful because these animals find their way with them.
老鼠、兔子和其他动物的脸上长着敏感的长毛，这非常有用，因为它们用这些毛来找路。
Trees are useful to man in three ways. Firstly, they provide man with food, wood and other products. Without trees, animals could not live on the earth.
树对人的益处有三个方面。首先，它们给人类提供了食品、木材及其他产品。如果没有树，动物无法在地球上生存下去。
These results indicated that the selection of double heterozygotes among offspring may be a useful way to improve the expression of exogenous genes in the transgenic animals.
结果提示，选育双重杂合子转基因后代小鼠，是一条提高转基因动物外源基因表达水平的有效途径。
Chemical reactor model is very useful to characterize the animal gut quantitatively and help us to interpret the digestive strategies of animals.
利用化学反应器模型及理论可以定量地描述动物的消化过程，阐述动物采取的消化对策和分析食物的消化动力等。
Conclusion the antisera produced in this study would provide the useful diagnostic reagents for detecting pathogenic bacteria in laboratory animals.
结论所制备的抗血清特异性强、效价高，为实验动物细菌学检测提供了有效的血清学鉴别诊断试剂。
Animals perform many useful and entertaining jobs.
动物承担了许多实用性和娱乐性的工作。
Animals perform many useful and entertaining jobs.
动物承担了许多实用性和娱乐性的工作。
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