HSK 7-9
故
gù副连
happening; instance; reason; cause
道路积水严重故车辆绕行。
Dào lù jī shuǐ yán zhòng gù chē liàng rào xíng.
The road is badly flooded, so vehicles are taking a detour.
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Appears across levels (7-9) in the HSK 3.0 word list.