HSK 7-9
奋力
fènlì副
to do everything one can; to spare no effort; to strive
落水者奋力游向岸边。
Luò shuǐ zhě fèn lì yóu xiàng àn biān.
The person in the water swam toward shore with all their strength.
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Appears across levels (7-9) in the HSK 3.0 word list.