One reason is that radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops, and thus reflects the beam.

一个原因是被用来追踪雷暴的雷达只可以发现大气中凝结成云或雨滴的水，因为水能以这样的形态反射波束。

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In Gardner's words, it entails the ability to detect patterns, reason deductively and think logically.

用加德纳的话说，它导致了检测模式、理性推理和逻辑思维能力。

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Part of the reason may be there's so much misinformation about how to detect lies floating around.

一部分原因可能是对于如何识别身边的谎言存在很多错误的信息。

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Part of the reason is that the equipment needed to detect seismic vibrations (and thus short-circuit human sensory inadequacies) has become cheap.

ECONOMIST: Extra sensory perception

The reason astronomers want to observe reflected sunlight during the transit of Venus is to test whether they can detect the faint imprint of passage of the sun's light through the atmosphere of Venus.

CNN: A transit of Venus, an age of wondrous science