Airplane Engines In 1945, a new type of airplane engine was invented. It was much lighter and more powerful than earlier engines, and enabled warplanes to fly faster and higher than ever. This type of engine was called the jet engine because it below

发表于:2018-11-30 / 阅读(106) / 评论(0) 分类 英语专业四级考试指南

[ti:王迈迈英语B级考试全真模拟试题与详解test8 听力] [ar:王迈迈] [al:王迈迈英语B级] [by:wmmenglish.com] [00:00.41]王迈迈英语B级考试全真模拟试题与详解test8 [00:00.52]test8 [00:03.14]Part I [00:05.32]Section A [00:07.62]Directions: [00:09.80]This sectio

发表于:2018-12-31 / 阅读(95) / 评论(0) 分类 王迈迈英语AB级考试讲解

One of the world's foremost analysts of North Korea's ballistic missile programs says reports of missile engine testing at a newly revealed facility appear credible. As VOA Seoul Correspondent Kurt Achin reports, North Korea is apparently able to te

发表于:2019-01-12 / 阅读(49) / 评论(0) 分类 VOA标准英语2008年(九月)

RACHEL MARTIN, HOST: I say renewable energy and you probably think wind or maybe the sun. You might be able to put the ocean's waves on that list, too. The Department of Energy is experimenting with this idea. The department is spending $40 million t

发表于:2019-01-16 / 阅读(44) / 评论(0) 分类 2017年NPR美国国家公共电台11月

One of the world's foremost analysts of North Korea's ballistic missile programs says reports of missile engine testing at a newly revealed facility appear credible. North Korea is apparently able to test its missiles under more realistic conditions

发表于:2019-02-14 / 阅读(33) / 评论(0) 分类 VOA双语新闻 2008年9月

North Korea today hailed its test of a new intermediate-range missile and claimed that it can now hit U.S. bases in the Pacific with a nuclear warhead. State TV broadcast footage of Sunday's launch. The missile traveled nearly 500 miles, but analysts

发表于:2019-02-25 / 阅读(42) / 评论(0) 分类 PBS访谈社会系列