The true value of positive audible feedback is that its absence is an extremely effective problem indicator.

正面听觉反馈真正的价值在于，它的缺失是非常有效的问题指示器。

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Customer complaints are a common indicator of low customer satisfaction but their absence does not necessarily imply high customer satisfaction.

顾客抱怨是一种满意程度低的最常见的表达方式，但没有抱怨并不一定表明顾客很满意。

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In the absence of a strong diagnostic indicator for disease such as the presence of a bacterium or a virus epidemiologists must collect indirect data.

ECONOMIST: Scientific justice

And the absence of a father or an intact marriage is a prime indicator for drug use and trouble with the law.

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