首先，由于中微子味荷的时间依赖性，普适的中微子味态是难以定义的，我们只能在有限的、近似的条件下使用味态这一概念。
First , because of the time-dependence of the flavor charge of the neutrino , it is difficult to define the universal flavor state . We can only employ the flavor state with the limited and the approximate conditions .
味荷