They seem to have many distinctive natures though they participate only in weak interaction.There are wide and important connections among them and basic theory of Particle Physics and Astrophysics.

• 它们虽然只参与弱相互作用，但它们似乎具有许多独特的性质，它们与粒子物理和天体物理的基本理论有着广泛的和至关重要的联系。