note that charge symmetry is not a strong enough condition to deduce the existence of π°; we need charge independence. 请注意：单靠电荷对称性不足以推出的存在，我们还需要电荷无关性。
2.
Charge symmetric pseudoscalar theory 电荷对称的赝标量理论
3.
Charge symmetric meson 电荷对称介子
4.
< uk > note that charge symmetry is not a strong enough condition to deduce the existence of ; we need charge independence . < / uk > < uk >请注意：单靠电荷对称性不足以推出的存在，我们还需要电荷无关性。 < / uk >
