当树中空或部分死亡时，它为小动物提供了一个家，也成为了许多其他动物的食物来源。
When a tree becomes hollow or part of it becomes dead, it provides a home for small animals and is a source of food for many other animals.
当一种动物不能在每一代都繁殖出足够的后代而与其死亡率保持一致时，它就会逐渐灭绝了。
An animal species becomes extinct when it fails to produce enough young in each generation to keep pace with the death-rate.
当这一切发生时，我们总是希望被猎杀动物已经休克，因为对加快它们的死亡（解除它们的痛苦）我们实在无能为力。
We always hope the preyanimal is in shock while this is happening, as there would be nothing we coulddo to speed up the prey animal’s death in any case.
当这一切发生时，我们总是希望被猎杀动物已经休克，因为对加快它们的死亡（解除它们的痛苦）我们实在无能为力。
We always hope the preyanimal is in shock while this is happening, as there would be nothing we coulddo to speed up the prey animal’s death in any case.
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