Clouds are formations of condensed water vapour.
云由凝聚水蒸气。
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Five weeks after the experiment began, all the plants were covered by bags that allowed carbon dioxide, oxygen and water vapour in and out, but stopped the passage of larger molecules, of the sort a beanstalk might use for signalling.
五周过后,实验人员给所有蚕豆都罩上了袋子,这种袋子允许氧化碳、氧水蒸出入,但那些豆茎可能用来发送信号大分子物质,却无法通过。