It is the rate of change, the sudden onset of the pressure change, that makes the sonic boom audible.

是变化的速率和发生的突然性使得音爆可以被听见。

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Food, especially fatty foods, slows gastric emptying (and the rate of drug absorption), explaining why some drugs should be taken on an empty stomach when a rapid onset of action is desired.

食物，特别是脂类食物，延缓胃排空速度(从而也延缓药物吸收速度)，这也就是为何某些希望迅速奏效的药物宜空腹服用的原因。

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If pollution continues to increase at the present rate, aerosols in the atmosphere will cause the onset of an ice age in about fifty years' time.

如果污染按目前的速度持续增加，大气中的悬浮物会导致未来五十年内一个冰河时代的开始。

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If anything, the authors conclude, persistent smoking may increase rather than decrease the rate of onset of dementia.

BBC: Smoking 'does not prevent Alzheimer's'

Now a new study from Quebec published in the Journal of the American College of Cardiology provides new information about the rate of new-onset AF following TAVI.

FORBES: Study Examines New-Onset Atrial Fibrillation After TAVI