柯林斯詞典vacuum flask (vacuum flasks) 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. 保溫瓶[美國英語] 返回 vacuum flask劍橋詞典a container that keeps hot liquids hot or cold liquids cold 保溫瓶；熱水瓶；冰瓶 也見 flask (HOT DRINKS) 返回 vacuum flask