vacuum flask
柯林斯词典
1. N-COUNT A vacuum flask is a container that is used to keep hot drinks hot or cold drinks cold. It has two silvery glass walls with a vacuum between them. 保温瓶[美国英语]
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1. N-COUNT A vacuum flask is a container that is used to keep hot drinks hot or cold drinks cold. It has two silvery glass walls with a vacuum between them. 保温瓶[美国英语]