Xiǎoshíhòu liǎng xiǎo wú cāi, zhǎng dà le què jiàn xíng jiàn yuǎn.
Innocent playmates as children, they drifted apart as they grew up.
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From 唐·李白《长干行》: 同居长干里,两小无嫌猜 — 'We lived together in Changgan, two little ones with no suspicion between us.' Li Bai's poem gave Chinese its favorite shorthand for childhood sweethearts.