化石记录显示，已经有许多物种存活了数百万年——那么我们为什么不能呢？
The fossil record shows that many species have endured for millions of years—so why shouldn't we?
我从来不用，并且我不能理解为什么我要用这个而不是拖出显示屏轻点。
I've never used it and don't understand why I would want to rather than tapping and dragging on the screen.
他显示与突破的频繁的通告相反，我们的当今的癌症控制模型不能根除大多数癌症和原因为什么。
He shows that, contrary to frequent announcements of breakthroughs, our current cancer control model cannot eradicate most cancers and the reasons why.
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