Synthetical application of these two instruments is valid.

表明两种方法的综合应用是有效的。

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Usually, this method requires two instruments: a voltage source and a picoammeter or electrometer.

通常，这种方法需要使用两台仪器：一台电压源和一台皮安计或静电计。

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Photo: A woman of Southern Ethiopia’s Mursi tribe holds two instruments of modernity, an AK-47 and an iPod.

照片：埃塞俄比亚南部Mursi部落的一名妇女手持两件新潮物品：AK-47和iPod。

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Tom McCarthy, writer-director of The Visitor, says Walter's experience with the two instruments says a lot about how the character gets transformed over the course of the film.

NPR: Learning to Drum �� and Live �� in 'The Visitor'

To solve these problems, it helps to have two instruments to hand: a carbon tax to discourage pollution directly, and subsidies or other incentives to encourage innovation around the cleaner input.

ECONOMIST: Economics focus

Then there would be two instruments for two goals.

ECONOMIST: Off target