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TOEFL BNC: 17640 COCA: 16075

convection

convection /kənˈvɛkʃən/ noun
convection
/kənˈvɛkʃən/
noun
Learner's definition of CONVECTION
[noncount] technical
: movement in a gas or liquid in which the warmer parts move up and the colder parts move down(气体或液体的)对流
also : the transfer of heat by this movement对流加热;热对流

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