Nocera and his team identified a set of inexpensive, common catalysts including nickel and cobalt that get the job done with far less expense.

诺赛尔和他的团队选择了一些低廉且常见的催化酶，如镍、钴等，这让他们花费很低的代价就完成了类似的工作。

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He fears that "once again California would be the great experiment for the rest of the world at the expense of public safety, community health and common sense."

他担心加州又要成为“小白鼠”，而代价则是公共安全与卫生以及道德底线。

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In societies where four or six children were common, a boy would almost certainly come along eventually; son preference did not need to exist at the expense of daughters.

在一个家家基本上都有四至六个孩子的社会，一个家庭几乎肯定会有一个男孩；想要儿子不必以牺牲女儿为代价。

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Nevertheless, Safeco Chief Executive MichaelMcGavickMichael McGavick, who will soon leave his post to run for the U.S. Senate from Washington State, hammered away at politicians he sees as pandering to individual voters at the expense of common sense business practices for the insurance industry.

FORBES: Magazine Article

Although some groups may flourish at the expense of the common weal, this danger can be guarded against if there are many groups and if all have the same freedom to organise and to put their case to government.

ECONOMIST: POLITICS BRIEF

An ordinary expense is one that is common and accepted in your industry.

FORBES: Why Santa Won't Owe Any Income Taxes This Year