Sunlight, therefore, is a mechanical wave created by many variable forces propagating huge energy through an electromagnetic wave medium.

由此可见，太阳光是太阳由于受到多个变力作用而形成的以电磁波(物质波)为媒介，始终传递着巨大能量的机械波。

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You've got a sound wave traveling merrily along through one medium, when suddenly it hits a different medium, what does gonna happen then?

声波在一种介质中顺畅地传播，突然触及了不同的介质，这时会发生什么？

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The paper reports that the roaches could skitter, wave their antenna, and even change size fromsmall and medium to hideously large.

该文中报道，蟑螂可以从面前飞过，摆动触须甚至可以将图像从很小一直放大到巨大。

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Today,Special English broadcasts thirty-minute programs by shortwave and medium wave sixteen times a day around the world.

VOA: special.2009.10.16

Many people in rural areas get most of their news from radio, which is dominated by the state broadcaster, although several stations based abroad broadcast to Zimbabwe on shortwave and medium wave.

BBC: Zimbabwe approves new constitution

Despite this, the main radio stations will still be broadcast on FM and medium wave as usual while the digital stations - such as 1 Extra and BBC7 - will still be available on satellite, cable, through digital radios and online.

BBC: New Freeview chapter for BBC Alba

There will be reductions in medium-wave transmissions for local radio in England where coverage replicates FM.

BBC: set to cut 2,000 jobs by 2017