同位素散布曲线

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The Earths crust is old. Billions of years old. So old that its nearly impossible to imagine. And now scientists have discovered what may be the oldest

发表于:2018-12-24 / 阅读(62) / 评论(0) 分类 Scientific American(九)月

Digital Access Protocol(DAP) 数 字 访 问 协 议 Digital Volt Meter(DVM) 数 字 电 压 表 Digital TeleVision(DTV) 数 字 电 视 digital circuit 数 字 电 路 digital 数 字 的 data safety

发表于:2019-01-03 / 阅读(41) / 评论(0) 分类 电信英语

Direct Inward Dialing (DID) DID is PBX-to-central office trunks that allow incoming calls to a PBX to ring specific stations without attendant assistance. DID greatly reduces the number of required co

发表于:2019-01-03 / 阅读(46) / 评论(0) 分类 电信英语

to throw a curve to throw for a loop 美国人在打棒球时经常喜欢发曲线球,使球的方向会发生突变,这样给对方造成错觉,不能回击那个球。这和其他球类运动,

发表于:2019-01-07 / 阅读(171) / 评论(0) 分类 美国习惯用语

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Theres definitely methane on Marsand there are seasonal variations of how much is being released into the thin Martian atmosphere. Which means that Mar

发表于:2019-01-08 / 阅读(53) / 评论(0) 分类 Scientific American(一)月

PENGUIN:What continent (大陆)is this ? ZEBRA:Manhattan(曼哈顿). PENGUIN:Hoover Dam(胡佛水坝/惨)!Were still in New York.Abort(终止计划).Dive(跳水,此处指下潜)!Dive!Dive. ZEBRA:Hey.You in the tux(燕尾服)

发表于:2019-02-16 / 阅读(52) / 评论(0) 分类 跟着美剧练发音