报警激光雷达

美国有线新闻 CNN 地震夷平意大利小镇解读地震预警系统

play pause stop mute unmute max volume 00:0002:36repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin. The mayor of Amatrice, which is located in central Italy

发表于:2018-12-02 / 阅读(87) / 评论(0)

CNN美国有线新闻2016年8月

VOA常速英语2008年-US Government Reviews Laser Eye Surgery

By Carol Pearson Washington 30 April 2008 Ten years ago, the U.S. Food and Drug Administration approved LASIK, eye surgery with a laser that enables people to see without glasses. But about five percent of LASIK procedures fail, and those patients ca

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VOA常速英语2008年（四月）

Tracking Outer Space Debris

Every year satellites are damaged or destroyed by objects orbiting the Earth's atmosphere. An Australian company is now using the latest laser technology to track these objects in order to reduce cosmic damage. Li Dong has the details. Even in space,

发表于:2019-01-19 / 阅读(66) / 评论(0)

世界各地新闻集锦

VOA常速英语2007年-Scientist in Texas Runs NASA's Lunar Laser Prog

By Paul Sisco Washington 14 November 2007 At the McDonald Observatory in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more. Research scienti

发表于:2019-01-31 / 阅读(74) / 评论(0)

VOA常速英语2007年（十一月）

军事英语词汇

军事英语词汇导弹 missiles 洲际导弹 intercontinental missile 中程导弹 mediurn-range missile 巡航导弹 cruise missile 核弹头 nuclearwerhead 地对地导弹 surface to-surface missile 地对空导弹 surface-to-air missile 舰对空导弹 ship-to-air missile 空对空导

发表于:2019-02-06 / 阅读(63) / 评论(0)

英文语法词汇

英文乡村歌曲：Hunter Hayes - Storm warning

Yeah Oh no She rolled in from the west in a summer sun dress Hotter than the heat in July With her wind blown hair it just wasn't fair The way she was blowin' my mind Have you ever noticed every hurricane Gets its name from a girl like this? She's a

发表于:2019-03-02 / 阅读(69) / 评论(0)

美国乡村音乐

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characteristic harmonics

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complete non-Archimedean valuation