“僵尸企业”的英文全称是“zombie company”，是经济学家彼得·科伊提出的一个经济学概念。僵尸企业都是效益不佳的企业，轻则连年亏损、资不抵债，重则难以为继、濒临倒闭。因此，僵尸企业毫无例外都是负债企业。僵尸企业不同于短期陷入困境的问题企业，问题企业一旦解决了问题，就能很快起死回生；僵尸企业则没有前景，可以说是扭亏无望。僵尸企业之所以能免于破产倒闭、“僵而不死”，一是因为有地方政府的保护照顾，二是因为有银行的贷款支持。

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    We see many animals, like rabbits(兔子), bees, dogs, birds, sheep……but do you know how these animals say things? First, let's see a rabbit. When a rabbit sees something dangerous, it runs away at once. When it runs, its tail(尾巴) moves up and down. When others see this, they run too.

    Many other animals use this kind of language. When a bee has found some food, it goes back to its home. It cannot tell other bees where the food is by speaking to them, but it does a little dance in the air. This may tell other bees where the food is.

    Some animals say things by making sounds like a man does. For example, a dog barks(吠) when a stranger(陌生人) comes near. Some birds can make several different sounds, each with its own meaning. In a word, every animal has its own language.

There are more than _________ students in their school.