The material of the external layer of the cup is of insulation materials or materials coated with insulation paint and the internal layer and the external layer can employ the same material.
杯的外层材料最好是保温材料或者涂上保温涂料，但内、外层相同材料也可以。
The material of the external layer of the cup is of insulation materials or materials coated with insulation paint and the internal layer and the external layer can employ the same material.
杯的外层材料最好是保温材料或者涂上保温涂料，但内、外层相同材料也可以。
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