在费米弱作用理论乃至弱电统一理论中，都是把中微子当作无静止质量的粒子来处理的。
In the Fermi weak interaction theory and even in the electro-weak unification theory, the neutrino is looked as the massless particle.
发现中微子(几乎是无质量的粒子)在离开太阳之前可转化介子，解开了一个40年的谜。
A discovery that neutrinos, virtually massless particles, convert into other forms known as muon and tau before they leave the sun, solving a 40-year-old mystery.
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