HSK 7-9
齐心协力
qíxīn-xiélìto work with a common purpose (idiom); to make concerted efforts; to pull together; to work as one
大家齐心协力修好了木桥。
Dàjiā qíxīnxiélì xiūhǎo le mùqiáo.
Everyone worked together to repair the wooden bridge.
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Appears across levels (7-9) in the HSK 3.0 word list.