Primary school Chinese: "The good and the bad are intermingled" means: the good and the bad are intermingled, or it can only be: there are good people and bad people.

Disease: Setaria viridis is like millet, and it is often mixed in seedlings. There are good and bad, mixed together.

Sentence-making: In view of the fact that students' math scores are mixed, Teacher Li has taught students in accordance with their aptitude in class and achieved ideal results.

In the origin of this idiom and idiom dictionary, it refers to people. But now it can also refer to things.