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 this is very important, because the Romans, as their power grew in the East, they simply moved increasingly into the eastern Mediterranean and they adopted the whole Greek system, the Greek world, and they didn't even try to make it non-Greek.

这点非常重要，因为随着罗马人的势力在东方日渐壮大，他们不断朝地中海东部推进,并采取了全套希腊系统，希腊世界，甚至没有作出任何非希腊式的改变。

耶鲁公开课 - 新约课程节选

People say we don't--well, we don't, but we do have an emergency care system so that anybody who is suddenly stricken will be taken to a hospital and taken care of.

人们说没有，好吧，那就没有，但我们确实有急救护理制度,让突然受伤的人,可以被送往医院并且得到救护。

耶鲁公开课 - 金融市场课程节选

Now, if I was a person that was designing a vaccine and I noticed that this was the response that it got, that antibodies were produced, they reached some intermediate level, they started to fall, I would say, "Well I haven't stimulated the immune system enough, let me re-boost, let me give another dose of antigen."

现在,如果我正在研究一种疫苗,我注意到机体会对这种疫苗产生应答,也就是会产生抗体,当抗体浓度达到中等水平后,就开始下降,就可以说,疫苗对免疫系统刺激还不足,我需要提高抗原浓度,让我再把剂量再加大一倍

耶鲁公开课 - 生物医学工程探索课程节选

The immune system, some cells of the immune system, in particular this class of T-cells called CD8 cells have receptors which recognize MHC1.

免疫系统,其中一些免疫细胞,特别是T细胞中的,CD8细胞含有可识别MHC1的受体

耶鲁公开课 - 生物医学工程探索课程节选

So, that's antigen presentation to this population of cells called cytotoxic T-cells, Tc, a subset of the class of T-cells in the immune system.

这些细胞被呈递给另一种细胞,这些细胞被称为细胞毒性T细胞,是免疫系统中T淋巴细胞的亚群中的一种

耶鲁公开课 - 生物医学工程探索课程节选

Here's where the intelligence of the immune system comes in, is that these cytotoxic T-cells that are generated only kill cells that have this signal on it.

免疫系统的聪明之处就在此,这些细胞毒T细胞,只能杀死具有特殊标记信号的细胞

耶鲁公开课 - 生物医学工程探索课程节选