The study warns that it is teenagers who engage in all three of these practices in the extreme who are truly in jeopardy.

该项研究警告称，真正处于危险境地的是那些采取这三种极端行动的青少年。

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Its intended purpose is to the study the extreme universe - exploding stars, cosmic jets, annihilating particles, and other stuff that we don't want happening near Earth.

其主要目标就是研究宇宙中的极端现象——爆发中的恒星、宇宙喷流、湮灭粒子，以及其它那些我们根本不想发生在地球附近的现象。

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In the most recent U.S. Census Bureau study, 2.8 million people have so-called extreme commutes, topping 90 minutes.

最近美国人口调查局研究显示，280万人有所谓极端上下班往返经历，时间长达90分钟。

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One study showed that extreme precipitation increased by 4% per year after dams were built.

BBC: Reservoirs can make local flooding worse, says study

Neal directs the Center for the Study of Disasters and Extreme Events at Oklahoma State University.

NPR: FEMA's Expanded Responsibilities Questioned

Mr. DAVE NEAL (Director, Center for the Study of Disasters and Extreme Events, Oklahoma State University): The media could get in and Wal-Mart could get in a day afterwards.

NPR: FEMA's Expanded Responsibilities Questioned