And we didn't know whether we were going to be looking at history or not because when you look at a curve like that, an exponential curve going up can often just tilt over and crash back down again.

我们并不知道是否会鉴证历史，因为，在您看到那样的一个曲线时，那种上升的指数曲线往往会再次倾斜下滑。

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Choose a chair that supports your back, including the curve in your lower back (if not, place a rolled up towel or pillow behind your lower back for support).

找把能靠背的椅子，椅背曲线要与自己的背部贴合，或者在你的背后卷条毛巾或放个枕头。

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Known as the forest transition, this can be visualised as a curve in the shape of a ski-jump, first sloping down steeply and then turning up gently as the forest creeps back.

这一过程被称为森林转变，它可被形象地表现为一条跳台滑雪型的曲线：一开始陡然下滑，之后随着逐步还林，曲线缓缓上升。

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