"We are going to need more taxpayer money up front. I think that another stimulus package is a reasonable probability, given the way things are going,"

VOA: standard.2009.03.10

This is a way for the immune system to recognize things that are going wrong inside the cell protected from antibodies.

这是免疫系统识别,抗体不能识别的细胞内病变的方法

耶鲁公开课 - 生物医学工程探索课程节选