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四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
弄清像电力,磁力和重力 之类的神秘力量究竟是什 么东西.
what such mysterious force as eclctricity, magnetism,and gravita- tion "really" are. ;
磁石如果失去磁力，就不能再吸东西了。
If a magnet loses its magnetism it will no longer attract things.
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