Windows Vex Bats' Echolocating Abilities 干扰蝙蝠回声定位的烦人窗 Just as humans understand the shape of our surroundings by how light reflects off objects, bats use reflections of sounds they produce insteadwhats called echolocation. But

发表于:2018-12-02 / 阅读(90) / 评论(0) 分类 2017年Scientific American(九)月

NASA Identifies Shuttle Endeavour's Heater Glitch NASA says engineers at Kennedy Space Center believe they have identified the cause of the heater failure that forced the postponement of the launch of the shuttle Endeavour. NASA technicians say the f

发表于:2019-01-14 / 阅读(95) / 评论(0) 分类 VOA标准英语2011年(五月)

Hubble's Gaze Extends to Edges of Universe Ever since the days of Galileo and the first optical telescopes more than 400 years ago, astronomers have been looking for ways to cast their gaze farther into the heavens around us. Today, thanks to the ear

发表于:2019-01-14 / 阅读(87) / 评论(0) 分类 VOA标准英语2011年(八月)

By Robert Berger Jerusalem 23 December 2007 Israel has rejected a ceasefire offer from the Islamic militant group Hamas, which rules the Gaza Strip. At the same time, Israeli settlement construction is casting a shadow over new peace talks between Is

发表于:2019-01-31 / 阅读(67) / 评论(0) 分类 VOA常速英语2007年(十二月)