人类是否会受到完全灭绝的威胁呢？
美国更南部的灰狼已经完全灭绝。
Further south in the United States the grey has disappeared completely.
“我跟你打赌，”他说，“世界上没有哪种科技完全灭绝了。”
I bet, he said, "there is no species of technology that's gone globally extinct on this planet."
夏斯报告说，在石油污染严重的地区，某些物种已几乎完全灭绝。
Chasse reported that some species that lived in heavily oiled areas were almost completely wiped out.
气候的突然变化使原本逐渐消融的冰川再次凝结，同时北美洲哺乳动物中有35个科完全灭绝。
The change in climate caused retreating glaciers to advance once again, and coincided with the extinction of 35 families of North American mammals.
例如，狄更逊水母，有的说是水母的近亲，有的说是海底蠕虫，有的说是地衣，有的甚至说它属于一个已经完全灭绝的物种。
Dickinsonia, for example, has been interpreted as being a relative of jellyfish, a Marine worm, a lichen, or even as a member of a completely extinct kingdom.
也就是说，如果我们不采取行动，做一些改变，这些平原上的大型猫科动物将完全灭绝，接下来，其他一切都会消失。
That is, if we don't take action and do something, these plains will be completely devoid of big cats, and then, in turn, everything else will disappear.
也就是说，如果我们不采取行动，做一些改变，这些平原上的大型猫科动物将完全灭绝，接下来，其他一切都会消失。
That is, if we don't take action and do something, these plains will be completely devoid of big cats, and then, in turn, everything else will disappear.
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