But the Mesozoic, too, began with a mass extinction.
但中生代本身便是以一次大灭绝开始的。
We're a million years over due for a mass extinction.
我们是一个100万年以上由于大规模灭绝。
Many scientists have therefore concluded that a sixth great mass extinction is currently in progress.
因此，许多科学家得出结论，第六次大规模物种灭绝正在发生。
Each mass extinction may have had a different cause.
每一次大灭绝可能都有不同的原因。
Each mass extinction may have had a different cause.
每一次大灭绝可能都有不同的原因。
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