这种真空瓶又叫“杜瓶”，可使盛在里面的液体不论泠、热温度都保持一定时间内不变。

This vacuum bottle can make temperature of the inside liquid constant in a certain time.

youdao

这种真空瓶又叫“杜瓶”，可使盛在里面的液体不论泠、热温度都保持一定时间内不变。

This vacuum bottle can make temperature of the inside liquid constant in a certain time.

youdao