单词：primordial segments
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This is Scientific Americans 60-Second Science. Im Cynthia Graber, this will just take a minute. For generations, nearly all medical research was done on men. And the assumption was that whats true for men is true for women. Now of course we know tha
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. The Earths original atmosphere would have been unpleasantdeadly in factto any organisms that breathe oxygen. There wasnt any. Not until about 2.4 billi
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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. In 1953 a student named Stanley Miller did an experiment showing that the simple chemicals present on the early Earth could give rise to the basic buildi
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AA: I'm Avi Arditti with Rosanne Skirble, and this week on Wordmaster, Musa Nushi, a 27-year-old Iranian with a master's degree in English teaching from Tehran University. MUSA NUSHI: English is in high demand in Iran because lots of people are going
英语单词大师-Word Master
AA: I'm Avi Arditti with Rosanne Skirble, and this week on Wordmaster: meet two young English teachers. One is from the United States, the other from Uzbekistan. RS: The American is a native English speaker who also speaks Arabic. He teaches a conver
英语单词大师-Word Master
I'm Avi Arditti with Rosanne Skirble, and this week on Wordmaster: we say hello again to English teacher Lida Baker in Los Angeles to talk about greetings in America. AA: So now typically, if someone says 'how are you doing?' ... RS: Yeah, typically
英语单词大师-Word Master