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

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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.

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。

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Compared with the other three forces in the universe (electromagnetism, the weak nuclear force and the strong nuclear force), gravity is relatively feeble, making gravitational waves hard to detect.

和宇宙中的其他三种力(电磁力、弱核力、强核力)相比，重力就微弱得多了，所以引力波很难被观测。

youdao

Electromagnetism, and also the strong and weak nuclear forces, are confined to their membranes, and thus to this universe.

ECONOMIST: A matter of gravity

These interact through electromagnetism, and also through the strong and weak nuclear forces.

ECONOMIST: Particle physics makes sense, but it assumes too much

Nor can the more exotic particles responsible for the weak and strong nuclear forces.

ECONOMIST: A matter of gravity