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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A year and a half ago, USA Today published an interesting article as a kind of wrap-up of the four-day annual meeting of the American Psychological Association.

一年半前，《今日美国》报上登载了一篇有趣的文章作为美国心理协会为期四天的年会总结报告。

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Brickyard Crossing, which used to host a Senior PGA event, is truly one-of-a-kind: four holes play inside the infield of the oval track, often with loud cars running by on test laps, linked by a tunnel to the fourteen holes just outside the stadium.

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Wallace suggests you not base your bets on "card odds" (the 1-in-50 chance of being dealt, for example, three of a kind versus the 1-in-4, 000 chance of being dealt four of a kind).

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Ivan Drury, a senior analyst at Edmunds, points out the arrival of the four-door Mini Countryman kind of a station wagon, but one with a lot of prestige.

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