他们说，恐怖袭击更少了，但成本与效益的平衡依然很差——收益约为开支的5%-8%。

There were fewer terrorist attacks, they say, but the balance of costs and benefits is still poor—between five and eight cents of benefit for every dollar spent.

youdao

相比之下，成本-效益分析则通过比较不同人群的获益和损失，提出改变规则的对策，使收益大于损害。

Incontrast, cost-benefit analysis weighs the gains and losses to differentindividuals and suggests carrying out changes that provide greater benefitsthan harm.

youdao

基本上，如果公园给使用者带来的收益大于给纳税者带来的损失，我们就说公修建公园的效益大于成本。

In principle, the park provides greaterbenefits than costs if the benefits to the users exceed the losses to thetaxpayers.

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