a thief in the family is difficult to detect
It's hard to guard against domestic thieves. Chinese idiom, Pinyin is Ji ā Z é in á NF á ng, which means that it's hard to guard against domestic thieves. It means that it's not easy to guard against bad people hidden inside. It comes from five Lantern Festival, Yuan Dynasty, Tongan Zhixiang shifasi.
The origin of Idioms
Shi Puji of the Song Dynasty wrote "five Lantern Festival yuan: Tongan Zhixiang shifasi": "how about when it's hard to guard against thieves?" The teacher said, "it's not wrong to know."
Idiom usage
It is the most difficult to guard against the bad people inside.
Chinese PinYin : jiā zéi nán fáng
a thief in the family is difficult to detect
evade the subject under discussion. wáng gù zuǒ yòu ér yán tā
live a simple life , showing one 's goal in life. dàn bó míng zhì
the feather is not yet fully grown. yǔ máo wèi fēng
remain mute as if one 's mouth were sealed. sān jiān qí kǒu