When a radio wave propagating in one medium impinges upon another medium having different electrical properties, the wave is partially reflected and partially transmitted.

电波在不同性质的介质交界处，会有一部分发生反射，一部分通过。

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The radio wave propagation velocity is slowed and the ray producing bend but to the asymmetry of the atmospheric medium, the refraction error is produced.

由于空中大气介质的不均匀性使得电波传播速度减慢射线产生弯曲，从而产生折射误差。

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This paper gives out a principle of medium-short wave receiver according to software radio technology. It can realize all function of medium-short wave receiver NBDP device, DSC device.

此文提出利用软件无线电技术实现海上中短波接收机的原理，该原理的研究能够实现现有海上中短波接收机、NBDP、DSC的功能。

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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

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