名词
中文翻译：对流
同义词：
['convection', 'circulation']
例句：
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1. The Earth's atmosphere is made up of layers, with the densest air at the bottom andthe thinnest at the top.
地球的大气层由不同层次组成，最密集的空气在底部，最稀薄的空气在顶部。
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2. The sun's energy is carried upwards by convection currents in the atmosphere.
太阳的能量通过大气中的对流运动向上传递。
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3.In the upper atmosphere, air rises due to thermal convection, causing the formation of clouds.
在上层大气中，由于热对流作用，空气上升形成云。