Difficult to teach is not an idiom, but a compound word, which consists of two words: hard work and teaching.

Hard work means hard work and willingness to suffer.

Teaching refers to the act of educating the target with certain knowledge or experience in one or more ways, and guiding them to correctly understand or apply the knowledge or experience taught. It refers to the act of educating the target with certain knowledge or experience in one or more ways, and guiding them to correctly understand or apply the knowledge or experience taught.

Extended data

synonym

overcautious (in small matters)

Pinyin: jρng jρng yèyè.

Interpretation: Describe being cautious and conscientious.

From: The Book of Songs, Elegant Han Yun, anonymous in the pre-Qin period: "If it is very early, it cannot be pushed. Conscientious, like thunder. "

The drought is so severe that it is impossible to push it away. Be careful and nervous all day, just like thunder falling on your head.

He works hard and never slacks off.