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.
绝大多数的当代物理学者都认为，人类永远无法弄清像电力、磁力和重力之类的神秘力量究竟是什么东西。
Most contemporary physicists have the notion that man can never discover what such mysterious forces as electricity, magnetism, and gravitation "really" are.
绝大多数的当代物理学者都认为，人类永远无法弄清像电力、磁力和重力之类的神秘力量究竟是什么东西。
Most contemporary physicists have the notion that man can never discover what such mysterious forces as electricity, magnetism, and gravitation "really" are.
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