Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has akindof 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
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has akindof theoretical knob that can be turned up or down to change its strength.
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。
3
A year and a half ago, USA Today published an interesting article as akindof wrap-up of the four-day annual meeting of the American Psychological Association.