用于跟踪风暴的雷达只能在大气中凝结成云或雨滴后才能够探测到水。
Radars used to track storms can detect water in the atmosphere only once it has condensed into clouds or raindrops.
云是由海洋中的水分被太阳加热蒸发而形成的，这些水分上升到大气中，凝结成微小的水滴，附着于微小的尘埃颗粒。
Clouds are formed from the evaporation of the oceans' water that is warmed by the Sun and rises high into the atmosphere, condensing in tiny droplets on minute particles of dust.
云是由大气中的水蒸气凝结成的。
A cloud is a condensation of water vapour in the atmosphere.
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