Knowing is knowing, not knowing is not knowing

Pronunciation: zhī zhī wéi zhī zhī, bù zhī wéi bù zhī, shì zhì yě.

Idiom explanation: If you understand, you understand; if you don’t understand, you don’t understand.

Examples of idioms: 〖Example〗The ancients were pragmatic and did not value ingenuity. Their remarks were not detailed, but the facts came first. If you know it, you know it; if you don't know it, you don't know it. Song Dynasty Lu Jiuyuan's "Book with Zhu Yuanhui"