“I have a dream...” It is among the most celebrated speeches in American history. “My four little children will one day live in a nation where they will not be judged by the color of their skin

发表于:2018-11-28 / 阅读(136) / 评论(0) 分类 疯狂英语2002年

Shareholders of the telecommunications equipment manufacturers Alcatel and Lucent have approved an $11 billion merger of the two companies. The new company, which will be called Alcatel Lucent, will be the world's largest telecommunications equipmen

发表于:2018-12-30 / 阅读(97) / 评论(0) 分类 初级商务英语听力2006

KELLY MCEVERS, HOST: For millions of Americans, what they flush down the toilet goes into a septic tank. Septic tanks are convenient, but sometimes they pollute our waterways. Scientists are trying to track down that pollution with help from a federa

发表于:2019-01-17 / 阅读(48) / 评论(0) 分类 2017年NPR美国国家公共电台5月

Why are there males and females? Why are there two sexes instead of three, or twelve, or one? On todayss Moment of Science we'll learn why two is the magic number. Let's start with why there is sex at all. When two organisms reproduce sexually, sperm

发表于:2019-01-26 / 阅读(52) / 评论(0) 分类 英语听力文摘 English Digest

矿山回填 oil residue recuperation 残油回收 radioactive waste management 放射性废物管理 recycled materials 回收的材料 recycling 回收 reuse of materials 材料再利用 sanitary landfills 卫生填埋 sea outfall 海洋排泄口 s

发表于:2019-02-18 / 阅读(52) / 评论(0) 分类 实用英语

Nutrigenomics 营养基因组学(nutrigenomics 或nutritional genomics,又叫营养遗传学 nutrigenetics)是研究营养素和植物化学物质对机体基因的转录、翻译表达及代谢机理的科学。 膳食是影响人体健康最重

发表于:2019-02-24 / 阅读(51) / 评论(0) 分类 英语听力文摘 English Digest