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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Background contexts request the understanding of language rhetorically modified should be under certain social cultural background;

背景语境要求理解经过修辞加工的语言要在一定的社会文化的背景下进行；

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Background contexts request the understanding of language rhetorically modified should be under certain social cultural background;

背景语境要求理解经过修辞加工的语言要在一定的社会文化的背景下进行；

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