HSK 7-9
力争
lìzhēng动
to work hard for; to do all one can; to contend strongly
我们力争提前完成全部任务。
Wǒmen lìzhēng tíqián wánchéng quánbù rènwu.
We will do our utmost to finish all tasks ahead of schedule.
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Appears across levels (7-9) in the HSK 3.0 word list.