HSK 7-9
前赴后继
qiánfù-hòujìto advance dauntlessly in wave upon wave (idiom)
救援人员前赴后继奔向灾区。
Jiùyuán rényuán qiánfùhòujì bēnxiàng zāiqū.
Rescue workers rushed toward the disaster area in wave after wave.
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Appears across levels (7-9) in the HSK 3.0 word list.