朗读 #92Clouds
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Howard believed that all clouds belonged to three distinct groups: cumulus, stratus and cirrus. He added a fourth category, nimbus, to describe a cloud in the act of condensation into rain, hail or snow. It is by observing how clouds change colour and shape that weather can be predicted, and as long as it is the first three of cloud to keep their normal shape there won't be any rain.
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题号#92