盗猎、森林砍伐以及近亲繁殖造成了牠们几近灭种。
Poaching, deforestation, and inbreeding have caused the near extinction of these big cats.
有一些动物已经灭种了，因为它们不能适应环境的变化。
Some species of animals have Become extinct Because they could not adapt to a changing environment.
如果人们爱猎杀多少大象就可以猎杀多少，大象就会灭种了。
Elephants would die out if men could shoot as many as they wished.
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