The requirements of coherence, mechanical stability of instrument and precision of optical device in interferometric methods are strict.

干涉的方法对光源相干性、设备的机械稳定性及光学器件的精度要求很高。

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The deuterium lamp is often used as ultraviolet ray lamp in UV measuring instrument, the measuring accuracy of the instrument has close correlation with the stability of radiation energy.

织物紫外线透过率测试仪是衡量织物抗紫外线能力的仪器，氘灯作为优选的紫外光源，其辐射强度的稳定密切关系到测量的精度和一致性。

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This system avoids thermal fluctuations and allows the stability of the instrument.

该系统避免温度波动，并使得仪器稳定。

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Because of the massive printing effort underway for some time now, the dollar has gone from an instrument of stability to an instrument of inflation.

FORBES: The Two Faces Of Ben Bernanke

The most potent criticism is that aiming for exchange-rate stability compromises the central bank in its task of controlling inflation one instrument (monetary policy) is being asked to do two things.

ECONOMIST: Off target