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BNC: 42899 COCA: 26960

a thick layer of material used to cover pipes, water tanks (= large containers), and other surfaces in order to stop heat from escaping or water from freezing保温层,防冻层

BNC: 42899 COCA: 26960
BNC: 42899 COCA: 26960
BNC: 42899 COCA: 26960

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