... background concentration 背景浓度 background level 背景等级 background light sensor 背景光感应器 ...
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他们被随机分为四组，并被置于不同等级的背景噪音环境中，从完全寂静到有50分贝、70分贝和85分贝的噪音。
They were randomly divided into four groups and exposed to various noise levels in the background, from total silence to 50 decibels, 70 decibels, and 85 decibels.
风险评价包括在一定的背景下，运用已建立的风险标准的风险分析过程中对比风险的等级。
Risk evaluation involves comparing the level of risk found during the analysis process with risk criteria established when the context was considered.
当美国人提及等级时，他们所想的是与财富无关的背景和观点。
When they talk about class, Americans mean a loose consideration of background and attitude that is unrelated to wealth.
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