胸腺核酸聚合酶

国家地理:Wings Over The Gulf 波湾战机 - 1

January 1991, an F-15 pilot on combat-air patrol sweeps the skies of Iraq. Sheridan, I'm Captain Medrimans, Captain in the 27th fighter squadron, flying in F-15 over Iraq. Today's been a mixed sweep, we started from the central, swept up for Bagdad,

发表于:2018-12-30 / 阅读(38) / 评论(0)

国家地理2007年

VOA标准英语2010年-Israel Successfully Tests Rocket Defen

Iron Dome defense system uses cameras and radar to track incoming rockets and can shoot them down within seconds of their launch. The system was developed by Rafael, the Israel Military Industries, at a cost of $200 million. Robert Berger | Jerusalem

发表于:2019-01-09 / 阅读(53) / 评论(0)

VOA标准英语2010年(一月)

VOA标准英语2012--Mapping Mountain Range Found Under Antarctic Ice

Mapping Mountain Range Found Under Antarctic Ice Its late afternoon at the Lamont-Doherty Earth Observatory, where Robin Bell is at work analyzing various images of glaciers and plotting her next expedition to the frozen southern pole. She takes a br

发表于:2019-01-13 / 阅读(47) / 评论(0)

VOA标准英语2012年(一月)

VOA常速英语2007-Pentagon Hopes Successful Missile Test Boosts Su

By Meredith Buel Washington 02 October 2007 The Pentagon says a recent successful test of the nation's missile defense system could boost support for the controversial project, which is designed to protect America from missiles fired by countries suc

发表于:2019-01-16 / 阅读(35) / 评论(0)

2007年VOA常速英语（十月）

VOA标准英语2008年-Russia: Iran's Current Missile Range Too Short

The United States and Russia continue sparring over a Central European missile defense system, as Secretary of State Condoleezza Rice says America is committed to protecting its allies from a possible Iranian missile attack, and her Russian counterp

发表于:2019-02-11 / 阅读(73) / 评论(0)

VOA标准英语2008年（七月）

VOA标准英语2009年-Gates: New Missile Defense Plan Will Bette

By Meredith Buel Washington 17 September 2009 Defense Sec. Robert Gates (L) and Joint Chiefs Chairman Adm. Michael Mullen arrive for a news conference at the Pentagon, 03 Sep 2009 U.S. Defense Secretary Robert Gates said Thursday that the decision t

发表于:2019-02-12 / 阅读(20) / 评论(0)

VOA标准英语2009年(九月)

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