脑壳

yào zhǎo chū rén lèi nǎo ké zhàng dà de lǐ yóu hái xū yào gèng duō de nǎo lì

要找出人类脑壳胀大的理由，还需要更多的脑力。

Finding the reason for humanity's swollen skull undoubtedly will take more brainpower.

nǐ shì bù shì nǎo ké huài la

你是不是脑壳坏啦！

Have you lost your head?