水传播的疾病 a water-borne disease
水传播的 water-borne
一种水传播的疾病 a water-borne disease
声波在水中传播的速度 Sound speed in water
一旦被人所知，它就迅速传播开来，替代了水钟，但却没有替代日晷，日晷被用来将新机器与原来的计时方法进行对照检查。
Once known, it spread rapidly, driving out water clocks but not solar dials, which were needed to check the new machines against the timekeeper of last resort.
与英国人相比，水传播疾病对日本人的影响弱得多。
Water-borne diseases had a much looser grip on the Japanese population than those in Britain.
而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
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