This allows a short-range phenomenon called the strong nuclear force to take over and causes the nuclei to merge and form helium.
之后会出现强核力占主导作用的短距效应，进而，原子聚合成为氦。
Scientists believe that gravity, electromagnetic force, strong nuclear force and weak nuclear force are the Four Basic Forces of the universe.
科学家们认为，万有引力、电磁力、弱力和强力是宇宙中的四种基本作用力。
Compared with the other three forces in the universe (electromagnetism, the weak nuclear force and the strong nuclear force), gravity is relatively feeble, making gravitational waves hard to detect.
和宇宙中的其他三种力(电磁力、弱核力、强核力)相比，重力就微弱得多了，所以引力波很难被观测。
Compared with the other three forces in the universe (electromagnetism, the weak nuclear force and the strong nuclear force), gravity is relatively feeble, making gravitational waves hard to detect.
和宇宙中的其他三种力(电磁力、弱核力、强核力)相比，重力就微弱得多了，所以引力波很难被观测。
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