top-hat policy

Hastings, a professor in the UC Davis Department of EnvironmentalScience and Policy, is one of the world's top experts in usingmathematical models ( sets of equations) to understand natural systems.

加州大学戴维斯分校环境科学与政策系教授黑斯廷斯，是世界上利用数学模型（方程组）来理解自然系统的顶级专家之一。

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The analyst says, if this issue can be resolved, it can open the possibility of addressing other problems--problems such as preventing Iran from acquiring nuclear weapons--a top U.S. foreign policy priority.

这位分析家表示，如果这项问题能够得到解决，就有可能解决其他问题，像是防止伊朗获得核武器这类问题。伊朗获得核武器的问题是美国外交上的头号优先。

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Participants in the annual Konstanz seminar earlier this year-including top European and US monetary economists-disagreed not only about what ECB policy should be but also about what it is.

在今年年初的康斯坦茨（Konstanz）年度研讨会上，与会者不仅对欧洲央行应制订什么样的政策意见不一，而且对欧洲央行目前实行的是什么政策也持不同看法。

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The statement released by the Central Economic Work Conference, the meeting of top leaders, said that China's policy makers faced the 'core task' of ensuring stable growth amid continuing economic headwinds and troubles with domestic security.

中央经济工作会议发布的公告称，中国政策制定者在经济遭遇持续阻力且行业安全问题堪忧的情况下面临确保经济稳定增长的核心任务。

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Si also said that the school's policy of allowing the top 190 students to choose their own majors is an act of "discrimination."

斯涵涵还说，学校允许前190名学生自主选择专业的政策是一种“歧视”行为。

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