暗中

HSK 7-9

ànzhōng

in secret; secretly

in secret; on the sly; surreptitiously

他在暗中观察。

tā zài ànzhōng guānzhe.

He was secretly observing

她暗中帮助了他。

tā ànzhōng bāngzhù le tā.

She discreetly helped him