单词:tunnel excavator
单词:tunnel excavator 相关文章
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
1. barometer /bəˈrɔmitə/ -- instrument for measuring atmospheric pressure as an aid in determining probable weather changes When the barometer indicates a rapid drop in air pressure, it means a storm is coming. 气压计显示出气压快速下降时
I really wish I could play a musical instrument. I cant. I had a few music lessons when I was a kid, but I didnt keep them up. I really regret that now. I get quite jealous of people who can play a musical instrument. Its a wonderful ability. I hope
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
Despite temperatures of around 30-degrees on Sunday, hundreds turned out in southwest Beijing to take part in what's known as an ultra-marathon. More than twice the distance of a marathon, which is just over 42-kilometers, ultra-marathons are conside
Despite temperatures of around 30 degrees Celsius on Sunday, hundreds turned out in southwest Beijing to take part in what's known as an ultra-marathon. More than twice the distance of a marathon, which is just over 42 kilometers, ultra-marathons are