单词：homologous helper plasmid
单词：homologous helper plasmid 相关文章
By Imran Siddiqi Washington 01 May 2008 Talking about fashion instantly evokes in many people images of models strutting down the catwalk. But the South Asian Student Association at Carnegie Mellon University in Pittsburgh, Pennsylvania recently took
VOA标准英语2008年（五月）
A: Where would you like me to take you? B: I need you to take me to PCC. A: I can do that. B: How long will it take you to get from here to PCC? A: Itll be about 25 minutes. B: You cant get there any faster than that? A: Thats as quick as I can do it
英语情景对话-邻居
Wouldnt it be great if we could trade genes with other species? For example, suppose you could trade the family cat your genes for intelligence for its genes for physical coordination! Well, okay, thats not likely to happen anytime soon. But DNA trad
英语听力文摘 English Digest
First Mr. Yee did a trick with scarves. 首先易先生用围巾变了一个戏法。 I told you, said Fox. 我说过吧，小狐说。 Then Mr. Yee made his helper vanish. 接着易先生将他的助手变没了。 Ho-hum, said Fox. 哼，小狐说。
小狐外传
At age eighteen, I left my home in Brooklyn, New York, and went off to study history at Leeds University in Yorkshire, England. It was an exciting but stressful time in my life, for while trying to adjust to the novelty of unfamiliar surroundings, I
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GWEN IFILL: But, first: If immigration is one of this year's big policy debates, the other is free trade. And when it comes to the future of how the U.S. does business abroad, the two major candidates are not sounding that far apart. Last week, corre
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