Over the past 540 million years, five mega-wipeouts of species have occurred through naturally-induced events.
在过去的五亿四千万年里，由于自然大事件，已发生过五次大规模的物种灭绝。
2
A new six-runway mega airport is being built to serve a predicted capacity of 120 million passengers a year.
一个新的六道大型机场正在建设中，它能为估计的未来每年1亿2000万名旅客提供服务。
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And since 2010, the Ministry of Education and Science has held a competition for mega-grants. Each winner of a mega-grant receives 3.5 million euros to establish a world-class laboratory in Russia.