Tree roots force their way into cracks in rocks and, in so doing, speed their splitting.

树根强行钻入岩石的裂缝，并以此加快了岩石的分裂。

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A Toyota rep showed up with the special laptop, but it yielded only the car's speed when it struck the tree: 44mph.

丰田汽车公司的代表处使用了特殊的笔记本电脑，但数据只显示出汽车撞树时的速度：每小时44英里。

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It's enough to make me dance at jogging speed across this fallen tree searching for footing to stay out of the drink.

风吹着，足够让我在这块木头上，以小跑的速度慌张地找落脚点，以免喝湖里的水。

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An accident investigator later examined the scene and estimated the speed at point of impact with the tree was between 30mph and 35mph.

BBC: Naomi Jones cleared of causing death by dangerous driving

The pair were on a fishing holiday and had been out on the loch in a boat when they saw what they thought was a tree trunk heading towards them at speed.

BBC: Monsters Inc: Scottish lochs and their creatures

Given the speed at which warming appears to be occurring, it's not clear whether tree species will be able to migrate fast enough to survive, said van Mantgem of the U.S. Geological Survey.

CNN: Global warming threatens forests, study says