柯林斯詞典Dewar flask /?dju??/ 1. N a type of vacuum flask, esp one used in scientific experiments to keep liquid air, helium, etc; Thermos (在科學(xué)實騐中用於保存液態(tài)空氣、氦等的)真空瓶; 熱水瓶 返回 Dewar flask