the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
对流。
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convectionn.对流
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conceptionn.怀孕；怀胎；受精；观点；想法；看法；认识；观念；构想；理解
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conversionn.转变；转换；转化；带球触地得分后再踢定位球得分；侵权行为；非法挪用；皈依；改变宗教；悔改后皈依；房屋的改建
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connectionsn.连接点；联系；关系；人脉；亲戚；（connection的复数）
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conventionsn.协定；会议；（convention的复数）
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collectionn.聚集；积聚；集中；收取；领取；一批；一群；学院期初考试；文集；诗集
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correctionn.改正；纠正；校正；修正值；所作的修改；不对；订正值；惩罚；教养；改造
"mid 19th cent.: from late Latin