一清二白

Pinyin: yī qīng èr bái

Explanation: clear; clearly. It also means very innocent; no stain.

Source: "Qilu Deng" by Li Luyuan of the Qing Dynasty: "Jia Likui said: 'Wang Zini and Zhang Shengzu are two people who are watching the lawsuit outside the second door. The master only asked these two to come to the case, and everything was clear. .'"

Example: This matter is much more important than the loss of a pack of cigarettes; she can't help but get one~.