HSK 7-9
来龙去脉
láilóng-qùmài(lit.) the rise and fall of the terrain (idiom); (fig.) the whole sequence of events; causes and effects
他把事情的来龙去脉讲清了。
Tā bǎ shìqing de láilóng-qùmài jiǎngqīng le.
He clearly explained the entire course of events.
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Appears across levels (7-9) in the HSK 3.0 word list.