外壳

hóng sè de rè shuǐ píng wài ké

红色的热水瓶外壳

the red outer casing of a thermos flask

dàn de wài ké

蛋的外壳

egg shell

zhǒng zi wài ké

种子外壳

husk of a seed

zhè jiǎ chóng yǒu jiān yìng de wài ké

这甲虫有坚硬的外壳。

This kind of beetles have hard shell.

tā yǐ qián de zì wǒ zhǐ shèng wài ké

他以前的自我只剩外壳。

There was only the husk left of his former self.