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To define wind speed and direction look at the shadow of a cloud on the ground.
空中风速及风向可由云在空中影子判断。
youdao
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Slight cloud floating in heaven, Slight wind blowing on the ground.
天上飘着些微云，地上吹着些微风。
youdao
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Slight cloud floating in heaven, Slight wind blowing on the ground.
天上飘着些微云，地上吹着些微风。
youdao