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

What's on the screen are computer generated faces of a Caucasian male and a Caucasian female who don't exist in the real world.

屏幕上面的这些是电脑生成的,一个高加索男性和一个高加索女性的面孔,他们在现实世界中并不存在

耶鲁公开课 - 心理学导论课程节选