Venezuelan President Chavez said in Moscow Sunday he had obtained a $2.2-billion line of credit from Russia for 90 T-72 tanks and an advanced long-range air defense system.

VOA: standard.2009.09.15

And so this slide just illustrates that in a simple way, the range of different kinds of organisms that your immune system is trying to--whoops!

这个幻灯片只是简要概括了,各种不同微生物的范围,你的免疫系统正在尝试,噢

耶鲁公开课 - 生物医学工程探索课程节选

And so this slide just illustrates that in a simple way, the range of different kinds of organisms that your immune system is trying to--whoops!

这个幻灯片只是简要概括了,各种不同微生物的范围,你的免疫系统正在尝试,噢

耶鲁公开课 - 生物医学工程探索课程节选