HSK 7-9
竭力
jiélì副
to do one's utmost
父亲竭力掩饰内心的担忧。
Fù qīn jié lì yǎn shì nèi xīn de dān yōu.
The father tried his utmost to conceal his concern.
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Appears across levels (7-9) in the HSK 3.0 word list.