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。

Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob.

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然而，四种基本力中，引力是至今发现最弱的一个。而且直到2002年，引力的量子特性才被证明。

However, of the four fundamental forces, gravity is by far the weakest, and it took until 2002 before gravity's quantum nature was proven.

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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.

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