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Translation
Amplification 增词法
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依据结构需要增词(Amplification in Grammatical Structures)
Were there no gravity, there would be no air around the earth.  假如没有重力，地球周围就没有空气。2. Using a transformer, power at low voltage can be transformed into power at high voltage.  假如使用变压器，低电压电力就能转化为高电压电力。
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增加概括性词语
The frequency, wave length, and speed of sound are closely related.  声音频率、波长和速度三者亲密相关。2. The chief effects of electric currents are the magnetic, heat ...