HSK 7-9
开工
kāigōng动
to begin work (of a factory or engineering operation); to start a construction job
桥梁维修工程今天正式开工。
Qiáo liáng wéi xiū gōng chéng jīn tiān zhèng shì kāi gōng.
Repair work on the bridge formally began today.
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Appears across levels (7-9) in the HSK 3.0 word list.