Two lines, three lines and four lines have different functions:
Two rows of bras are usually light and suitable for summer or climbing stairs. They are translucent and beautiful.
The third row is conventional at present, and it is basically worn at home;
Four rows and above are basically adjustable, suitable for ordinary work and keep adjusting body shape.
The number of rows of buckles actually increases the fixity of the bra. The bigger a girl's chest is, the easier it is to sag. At this time, multi-row buttons come into play. Using steel rings can prevent girls from sagging breasts. Usually, 2 rows are enough for A and B, 3 rows for C and 4 rows for D and E, and the number above F can be increased according to the situation. Actually, if it's F, G, H, row 5, it's almost the same.