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。
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。
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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