Gǔshū shuō jiāorén de yǎnlèi huì biànchéng zhēnzhū.
Old books say mermaids could weave silk that turned to pearls when they wept.
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鲛 is the old literary word for 'shark'; the everyday word is 鲨鱼. It is famous through 鲛人, the Chinese 'mermaid' whose tears were said to become pearls.