If frogs ever become endangered, we know why.
如果青蛙可能濒临灭绝的话，我们知道是什么原因了。
A species can become endangered for different reasons.
一个物种濒临灭绝危险有多种不同的原因。
The giant panda has become an endangered species.
大熊猫已成了一种濒临灭绝的动物。
The giant panda has become an endangered species.
有些物种由于人们的无和而灭绝。
This rare bird has become an endangered species.
这种珍禽已成为濒临灭绝的物种。
This rare bird has become an endangered species.
这种珍禽已成为濒临灭绝的物种。
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