《 Zhuāngzǐ · Liè Yùkòu 》 lǐ yǒu yí ge gùshi, shuō qiānjīn bǎozhū yídìng cáng zài hēi lóng de xiàba dǐxia.
A story in the Lie Yukou chapter of the Zhuangzi says that a priceless pearl must lie under the chin of the black dragon.
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The 庄子 chapter opens with Lie Yukou setting out for the state of Qi, so it takes his name, like most of the book's later chapters. It is the source of 探骊得珠 and of the saying that the skilful must toil, which lives on as 能者多劳.
