仪器需要校正，缩短校正周期。

Instrument need calibration, reduce calibration period.

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为了确保新卫星数据与现有的旧数据兼容，新仪器需要对照旧仪器进行校正。

To make data from the new satellites compatible with those collected by the old ones, the new instruments have to be calibrated against the old.

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NDA 标准样品是成功应用NDA技术的关键，几乎所有的NDA仪器和方法需要标准样品来进行效率刻度和各种响应校正。

NDA standards are an essential part of successful application of NDA techniques, almost NDA instruments and methods require standards to make efficiency calibration and various response corrections.

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