HSK 7-9
灵机一动
língjī-yídònga bright idea suddenly occurs (idiom); to hit upon an inspiration; to be struck by a brainwave
他灵机一动想出了省水办法。
Tā língjīyídòng xiǎngchū le shěngshuǐ bànfǎ.
A bright idea struck him, and he found a way to save water.
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Appears across levels (7-9) in the HSK 3.0 word list.