n. 背药红景天

国家地理-2008-03-20 Rho Ophiuchi Cloud 璀璨的星云

Rho Ophiuchi dark cloud is one of the closest star-forming regions to our own solar system. Located near the constellations Scorpius and Ophiuchus, the nebula is about 407 light years away from Earth. The infrared astronomical satellite, now celebra

发表于:2018-12-05 / 阅读(62) / 评论(0)

国家地理2008年

VOA慢速英语2009-THIS IS AMERICA - Alaska and Hawaii Mark 50 Year

VOICE ONE: Welcome to THIS IS AMERICA in VOA Special English. I'm Barbara Klein. VOICE TWO: And I'm Steve Ember. The United States has had fifty states for fifty years. Alaska and Hawaii both joined the Union in nineteen fifty-nine. They were the fi

发表于:2019-01-11 / 阅读(43) / 评论(0)

VOA慢速英语2009年（三）月

VOA慢速英语2014 When Is a Choice Not Really a Choice 选择

When Is a Choice Not Really a Choice 选择 Now, the VOA Special English program WORDS AND THEIR STORIES. 现在是美国之音慢速英语词汇掌故节目。 Making choices is necessary, but not always easy. Many of our expressions tell about this

发表于:2019-01-12 / 阅读(65) / 评论(0)

2014年VOA慢速英语(一)月

VOA慢速英语2011--Words and Their Stories: Hobson’s Choi

Words and Their Stories: Hobsons Choice Now, the VOA Special English program WORDS AND THEIR STORIES. 现在是美国之音慢速英语词汇典故节目。 Making choices is necessary, but not always easy. Many of our expressions tell about this dif

发表于:2019-01-12 / 阅读(49) / 评论(0)

2011年VOA慢速英语(四)月

美国国家公共电台 NPR No Snapchat In The Bedroom? An Online Tool To Manage Kids' Media Use

No Snapchat In The Bedroom? An Online Tool To Manage Kids' Media Use play pause stop mute unmute max volume 00:0004:03repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your F

发表于:2019-01-17 / 阅读(29) / 评论(0)

2016年NPR美国国家公共电台10月

2006年经济展望

Anchor:Your money in the year 2006. Is this the time to get that great new job? Is this the time to sell or to buy a new home? Well our financial contributor Mellody Hobson has canvassed all the exper

发表于:2019-02-04 / 阅读(80) / 评论(0)

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4-dioxypyrimidine

Aform DNA

agricultural activity

ambiguity problem

aneuploid cell

animal injury protection