Supplemented with: The square is very lively at night, with children playing and aunts dancing.
Explanation and analysis: supplementation is the opposite of abbreviation, it is based on the main branches and leaves, that is to say, according to the expression of the need to add on the determinative, the gerund, the complementary and other collateral components, according to the original sentence, then you can modify it to: the square is very lively at night, there are children playing, and there are aunts dancing in the square.
Expanded Information:
Methods of Complementation
As in. "Xiao Ming reads books", the front part is "Xiao Ming", first add who Xiao Ming is and his relationship with me, so that the front part can be expanded to "my classmate Xiao Ming";
The latter part can be added "in what place" "how to read", so that the latter part can be added to "in the classroom to read carefully", the whole sentence expanded to "My classmate Xiaoming is reading seriously in the classroom."