HSK 7-9
竭尽全力
jiéjìn-quánlì(idiom) to spare no effort; to do one's utmost
全队竭尽全力完成救援任务。
Quán duì jié jìn quán lì wán chéng jiù yuán rèn wu.
The whole team spared no effort to complete the rescue mission.
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Appears across levels (7-9) in the HSK 3.0 word list.