máo bìng
一听声音就知道这台机器有毛病
Yì tīng shēngyīn jiù zhīdào zhè tái jīqì yǒu máobìng.
You can tell this machine has a problem just by listening to the sound.
他做事容易出毛病。
Tā zuò shì róngyì chū máobìng.
He tends to make mistakes when doing things.
这孩子上课时有做小动作的毛病。
Zhè háizi shàngkè shí yǒu zuò xiǎo dòngzuò de máobìng.
This child has the bad habit of fidgeting during class.