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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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

Agreements are imminent on strategic arms, chemical weapons, conventional forces and nuclear testing.

CENTERFORSECURITYPOLICY: Can The United States Afford Not To Be Properly Defended?

Taken together, these instruments have come to be called "soft power" (as opposed to the traditional kind of "hard power" represented by armies, navies, air forces and nuclear weapons).

CENTERFORSECURITYPOLICY: Soft power unplugged

The adjective "sole" has become a key measurement in diplomatic circles where U.S. nuclear forces have long been seen as an impediment to stopping nuclear proliferation.

WSJ: U.S. Keeps First-Strike Nuclear Strategy