英国医疗服务虽已颇具规模，但仍然在以惊人的速率增长。

Britain's health service, already big, has been growing at a phenomenal rate.

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二氧化碳从海洋中泄露出来，原因有两点，一是冰层融化，导致海洋气体溶解速率增长。

Rising temperatures make carbon dioxide leak from the oceans for two main reasons. First, melting sea ice increases the rate that the ocean mixes, which dredges up CO2-rich deep ocean waters.

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但是假如风持续的以一个相同的速率增长的话，那么在本世纪中叶，飓风将变得更具破坏力。

But if winds continue to pick up at the same rate, hurricanes could become far more damaging by the middle of the century.

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This is the starting speed, that's the rate at which it is gaining velocity, and that's how long it's been gaining it.

这是起始时的速度,这是速度的增长速率,这是加速的时间

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It's gaining speed at some rate a.

速度的增长速率为a

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