蒙在鼓里

yào bu shì xiāo ēn tí qǐ zhè jiàn shì wǒ hái méng zài gǔ li ne

要不是肖恩提起这件事，我还蒙在鼓里呢。

I would have remained in ignorance if Shaun hadn’t mentioned it.

guān yú zhàng fu de xíng wéi tā yī zhí méng zài gǔ li

关于丈夫的行为，她一直蒙在鼓里。

She was kept in ignorance of her husband's activities.