HSK 4
Māma gěi wǒ zhuāng le yí ge bǎowēn fànhé dài qù xuéxiào.
Mom packed me an insulated lunchbox to take to school.
HSK 6
Gōngdì shàng de gōngrén zhōngwǔ dōu chī bǎowēn fànhé lǐ de fàn.
Workers at the construction site eat lunch from their insulated containers at noon.
HSK 7-9
Zhè kuǎn bǎowēn fànhé néng bǎowēn liù ge xiǎoshí.
This thermal lunchbox keeps food warm for six hours.
