The index system of a trade has characteristic of the time, it exists under certain economic environment and era background.

一个行业的指标体系是有时代特征的，它存在于一定的经济环境和时代背景下。

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The testing results show that the performances of the unit are satisfactory and it has certain applicability under the weak background light.

测试结果表明该装置在背景光微弱的情况下，性能令人满意，具有一定的实用性。

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