炎炎盛夏，人们在一个大瓷缸中放入冰块，再将瓷缸放入房中，用以降低房间温度。这种用冰块降温的方法其实早在先秦就已经有了。
yányán shèngxià ，rénmen zài yígè dà cígāng zhōng fàngrù bīngkuài ，zài jiāng cígāng fàngrù fáng zhōng ，yòngyǐ jiàngdī fángjiān wēndù 。zhèzhǒng yòng bīngkuài jiàngwēn de fāngfǎ qíshí zǎo zài xiānQín jiù yǐjīng yǒu le 。
In the scorching hot summer, people put ice cubes in large porcelain jars, which were then placed in rooms to help cool the temperature. This method of cooling with ice was already used in the pre Qin dynasty