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。

youdao

Both sides put their nuclear forces in high alert.

双方的核力量都在高度戒备中。

youdao

One of the most exciting ideas in modern physics is that gravity is not a traditional force, like electromagnetic or nuclear forces.

现代物理学最令人兴奋的观点之一是重力不是像电磁力和核力一样是传统力。

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not the usual enhancement, but rather qualitative enhancement - above all through the strategic nuclear forces.

VOA: standard.2009.03.20

"It slashed U.S.and Russian strategic nuclear forces from 1990 levels of about 10,000 deployed strategic warheads each down to approximately 6,000 by the year 2001,"

VOA: standard.2009.12.07

So both sides have gone well below the original START-One ceilings for their nuclear forces."

VOA: standard.2009.12.07

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

ECONOMIST: A matter of gravity

And we agreed that NATO should be prepared to considered reciprocal reductions in non-strategic nuclear forces deployed in Europe.

WHITEHOUSE: Press Briefing on NATO Defense Capabilities

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

ECONOMIST: A matter of gravity