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Although there are many different types of clouds, they are all composed of the same basic substance. Ea cloud cons of ti drops o water o ice, wh are usu too sm to b seen wi the naked eye. These particles cluster together and form an invisible gas known as water vapor. Some of this vapor attaches to microscopic bits of dust or ice floating in the atmosphere. When enough of these elements combine, they create a visible cloud.
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参考答案：ch ists ny f r ich ally all e th