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在美国黄石国家公园，曾经栖息着土生土长的狼群，直到有一天，狩猎者将它们驱逐殆尽。然而到了 1995 年，（由于一个激进的管理项目）狼群开始重新回归，一些有趣的现象出现了：黄石国

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[00:04.36]American officials are seeking ways for cities to grow without expanding into surrounding open space. [00:14.00]They are trying to rebuild the centers of older industrial cities. [00:19.91]And they want to help people use less resources suc

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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This'll just take a minute. The Patriot Act and the Bioterrorism Preparedness Act were passed in 2001 and 2002. These laws in part cover research on pathogens and toxins thought to

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1. Federal agents expect to be at this Detroit-area horse farm for several weeks to search for clues to Jimmy Hoffa's disappearance. The former Teamsters leader vanished in 1975. 2. The general tap pe

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absconditus

actions for passenger claims

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boat spike

cartographic simplification

cesium permanganate

chorionic retrograde degeneration