It is still true that a dog is the most useful animal in the world.

狗是世界上最有用的动物，这一点仍然是正确的。

youdao

Perhaps this is an example of how, in the real world, it is impossible to escape the responsibility that one sometimes has to take the life of an animal.

或许这是现实世界中的一个例子，就是人不可能既逃避责任又在某些时候不得不夺去动物的性命。

youdao

It is really hard to tell which animal is the most poisonous in the world.

最毒的动物？

youdao

In fact, it has more plant and animal species than any other savannah in the world and is more threatened than the rainforest at least in the coming decade.

ECONOMIST: Letters

It is as though we are determined to regress to the most primitive condition of existence in the animal world, of the survival of the fittest.

ECONOMIST: The Johannesburg summit