It offers the possibility of a double benefit—discouraging harmful activities, while also providing the government with revenue.

它提供了一种双重效益的可能性，既能阻止有害活动，又能为政府提供收入。

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They also get a double benefit, because their interaction is two-way.

他们也得到双倍的收益，因为他们的交流是双向的。

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Exercise. Be physically active by doing something you enjoy, that way you will be experiencing double benefit.

锻炼。积极锻炼身体，做你喜欢做的事情，这样你就可以收获双重好处。痷。

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While too much sodium is associated with cardiovascular problems, too little potassium can have the same effect, so potassium chloride has a double benefit.

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The hope is that emerging-market banks will enjoy a double benefit.

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The plan to invest some of the Social Security trust fund on Wall Street purports to address this: real assets would henceforth back the promise and, you might think, there is a double benefit because returns on Wall Street are higher than returns on the fund's existing portfolio of bonds.

ECONOMIST: Social Security meets Wall Street | The