但是近年来人类的行为已经引起了世界范围内鸟类数量的急剧减少。
But human impact have recently caused a dramatic drop in the bird's Numbers worldwide.
迄今为止，人类所发现的物种数量约为190万种1。
The number of living species thus far discovered is approximately 1.9 million.1.
如果人类的数量少于规定数量，那么僵尸就赢了。
If less than a certain number of humans survive the attack, the zombies win.
如果人类的数量少于规定数量，那么僵尸就赢了。
If less than a certain number of humans survive the attack, the zombies win.
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