袋鼠是一种奇怪的动物。
人就是这样一种奇怪的动物，拥有的时候厌倦，失去回首的时候才酸痛。
Human is such a strange animal that when we mostly did not cherish something until we lost it.
人就是这样一种奇怪的动物，拥有的时候厌倦，失去回首的时候才酸痛。
It can be evidenced by the fact that we have learnt to deny something habitually and therefore lost a lot of things.
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