单词：vertical moving rail switch
单词：vertical moving rail switch 相关文章
By measuring how fast these stars were moving, he could prove if there really was a black hole at the center of an active galaxy. I picked a galaxy nearby which is called NGC 1068, an active galaxy, w
超大质量黑洞
AS IT IS 2014-06-18 Railroad Safety a Concern in Northern US 美国北部的铁路安全存在隐患 North Dakota is the second largest oil-producing American state, after Texas. Companies remove about one million barrels of crude, unprocessed, oil f
2014年VOA慢速英语(六)月
President Barack Obama wants the United States to join other industrialized countries in having an extensive high-speed rail system. The president has unveiled his plan to accelerate the development of high-speed rail in the U.S. President Obama, ac
VOA标准英语2009年(四月)
elevated railway, overhead railway, aerial railway 高架铁路 mine railway 矿区铁路 funicular (railway) 缆索铁路，登山铁路 light railway line 轻便铁道 urban railway 市区铁路 rai
英文语法词汇
Beijing, August 14 (Xinhuanet) -- The National Development and Reform Commission (NDRC)（国家发改委） on Friday approved a batch of inter-city rail transit networks, spanning more than 2,000 kilometers, to accelerate（加速） regional integ
英语新闻
Without the search for mates or the ensuing courtship rituals, parthenogenesis means big savings in time and energy: in just one season, a single aphid can give rise to billions of descendants.But in the fall, fresh food gets harder to find and there
英语时差8，16