"study, study, ask if you don't understand" means: learning means asking while learning. Ask as soon as possible if you don't understand, don't pretend to understand. Explain that everyone's knowledge is limited. Ask if you don't understand. This is an effective way to acquire knowledge.

"Ask if you don't understand" tells the story of Sun Yat-sen who dared to think independently and question when he was a child in a private school. In order to understand the meaning in the book, he is not afraid of her husband's punishment.

In the article, the author compares students' reading to singing by using the rhetorical device of metaphor, and vividly writes out the reading state of students. It can be seen from the students' performance that everyone is afraid of Mr. Wang, which is in sharp contrast with Sun Yat-sen's behavior, indicating that it takes great courage for Sun Yat-sen to ask if he doesn't understand.

"Xue" is a Chinese vocabulary, and the pinyin is xuéwèn, which is interpreted as learning and inquiry, knowledge and so on. From "Ganyi": "Gentlemen learn to get together and ask questions."