📍Regarding the saying that Japanese bra cups are filled with water

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📍Regarding the saying that Japanese bra cups are filled with water
Actually, it is because the calculation methods of bra cups in different countries are different:

①The only common parts in different countries are the upper bust and the lower bust
The upper bust is the highest point of the breast, and the lower bust is the lower edge of the chest

②The calculation method of bra cups in Japan is upper bust-lower bust
(Unit: cm)
A＝10 B＝12.5
C＝15 D＝17.5 One more cup for every 2.5 cm, and so on

③The calculation method of bra cups in Taiwan is upper bust-lower bust
(Unit: cm)
A＝12.5 B＝15
C＝17.5 D＝20 One more cup for every 2.5 cm, and so on

④The calculation method in Europe and the United States is upper bust-(lower bust+5)
(Unit: inches)
AA＝0.5 A＝1
B＝2 C＝3
D＝4 DD＝5

After the size conversion, suppose a girl has a bust of 85cm and a bust of 70cm,
For example: a Japanese bra is a C cup, a Taiwanese bra is a B cup, and a European and American bra is an A cup...