It is well known that symmetry breaking and quark confinement are two open problems in theoretical physics.
众所周知，对称性破缺与夸克禁闭问题是理论物理中悬而未决的两大疑难。
One of the most challenging open problems in heavy quarkonium physics is the double charm production in annihilation at B factories.
B 工厂中通过双的单举和遍举的产生是重夸克偶素物理中的一个具有很大挑战性的课题。
One of the most challenging open problems in heavy quarkonium physics is the double charm production in annihilation at B factories.
B 工厂中通过双的单举和遍举的产生是重夸克偶素物理中的一个具有很大挑战性的课题。
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