Well, as you all know, there are four fundamental forces in physics: electromagnetism, strong nuclear interaction, weak nuclear interaction and gravity.
众所周知，在自然界中有四种基本的相互作用力：电磁力、强相互作用力、弱相互作用力和万有引力。
Well, as you all know, there are four fundamental forces in physics: electromagnetism, strong nuclear interaction, weak nuclear interaction and gravity.
众所周知，在自然界中有四种基本的相互作用力：电磁力、强相互作用力、弱相互作用力和万有引力。
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