HSK 7-9
里程碑
lǐchéngbēi名
milestone
这次发现是医学史上的里程碑。
Zhè cì fāxiàn shì yīxuéshǐ shàng de lǐchéngbēi.
This discovery is a milestone in the history of medicine.
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Appears across levels (7-9) in the HSK 3.0 word list.