Each of the four fundamental forces (gravity, electromagnetism, and the strong and weaknuclear forces) has a kind of theoretical knob.
四种基本力(万有引力、电磁力、强核力和弱核力)中的每一种都有一个理论上的旋钮。
2
Scientists believe that gravity, electromagnetic force, strong nuclear force and weaknuclear 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。
3
Well, as you all know, there are four fundamental forces in physics: electromagnetism, strong nuclear interaction, weaknuclear interaction and gravity.