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

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。

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

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。

youdao