In the production practice, will encounter a large number of non-sine wave.

在生产实践中，会遇到大量的非正弦波。

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Even if it worked with three-phase sine, three-phase line current would have non-sine aberrance and produce harmonic wave-electricity.

即使在三相正弦激励的作用下，三相线电流也将发生非正弦畸变，产生谐波电流。

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In this paper, the functional influence of input voltage non-sine of Varible-frequency voltage source on Electric Power Dynamometer motor discussed. and methods of improving them were also given.

讨论了变频电源输入电压的非正弦对测功电机的性能影响，提出改善不利影响的措施。

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Mental health counselling may prove to be a sine qua non to successfully re-integrating child soldiers into civilian life.

FORBES: For Child Soldiers, Every Day Is A Living Nightmare

Or to put it another way, banking union might be a precursor to the kind of fiscal and balance-sheet union that is widely regarded as the sine qua non of eurozone survival, but that supposedly vital financial union has not happened yet.

BBC: Eurozone banking union that works for Britain?