2. The color of shallots is half white and half green, and tofu is white. Therefore, it is an idiom to say that one is green and two is white, and the green is homophonic. Homophonic xiehouyu is also one of the most commonly used techniques.

This two-part allegorical saying is often used to describe that one's heart is innocent or clear.

4. Source: Mao Dun's "The Remains of Robbery" 4: You still don't believe me? I have been here for half a year, and I have always been very clear.