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我们知道,自然界存在着四种相互作用力,把核子约束在原子核中需要强相互作用力,构造原子需要电磁相互作用力,而创造恒星和银河系则需要万有引力。至于弱相互作用力则是保证宇宙间的动力学所必不可少的。
We know that there are four kinds of interaction forces in the nature. Confining the nuclei in the nucleus requires strong interaction forces. The construction of atoms requires electromagnetic interaction forces. The creation of stars and the Milky Way requires gravitation. As for weak interactions, it is essential to ensure the dynamics of the universe.