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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Together, they are strong and can't be harmed even by great forces.

当它们团结一致，就是强大的，即使是巨大的力量也伤害不了它们。

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And American interests are nowadays challenged by strong indigenous forces.

时下美国利益正受到本土力量的强大挑战。

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And now, finally,the British, American, Canadian and other Allied forces felt strong enough to attack across the English Channel.

VOA: special.2011.06.16

Often,he would pass islands with strong enemy forces, cut off their supplies and leave them with no chance to fight.

VOA: special.2009.05.24

Northern forces were strong enough. There were about one hundred fifty thousand Union soldiers in and around Washington.

VOA: special.2009.09.17

Until now, the collection of factors cited as bringing on the angst have included societal and economic pressures that exert psychological forces strong enough to bend our lives into the famous U-shaped curve of happiness.

FORBES: Study: Humans Aren't the Only Apes that Have a Midlife Crisis

Too much disclosure during good times, when corrective market forces are strong, may lead investors to stop paying attention to this information.

FORBES: Magazine Article

Special Forces recruitments remain strong, but it takes several years to train new operatives.

NPR: Military Works to Retain In-Demand Special Forces