běi北rén人shēng生ér而bù不shí识líng菱zhě者,shì仕yú于nán南fāng方,xí席shàng上dàn啖líng菱,bìng并ké壳rù入kǒu口。huò或yuē曰:“shí食líng菱xū须qù去ké壳。”qí其rén人zì自hù护suǒ所duǎn短,yuē曰:“wǒ我fēi非bù不zhī知,bìng并ké壳zhě者,yù欲yǐ以qù去rè热yě也。”wèn问zhě者yuē曰:“běi北tǔ土yì亦yǒu有cǐ此wù物fǒu否?”dá答yuē曰:“qián前shān山hòu后shān山,hé何dì地bù不yǒu有?”
fū夫líng菱shēng生yú于shuǐ水ér而fēi非tǔ土chǎn产,cǐ此zuò坐qiáng强bù不zhī知yǐ以wéi为zhī知yě也。