By cell/cell contact, I mean that there's a receptor in one cell that makes some kind of a chemical interaction with a receptor in another cell.

通过细胞之间的接触,我的意思是在一种细胞上的受体,能与另一细胞上的受体发生某种化学反应

耶鲁公开课 - 生物医学工程探索课程节选

Sometimes signals are transmitted between cells by cell/cell contact.

有时细胞与细胞靠互相接触进行信号传递

耶鲁公开课 - 生物医学工程探索课程节选

Another subset of T-cells called T helper cells will recognize that signal by direct contact with it, and they will become activated and proliferate.

另外一个T细胞的亚群是辅助性T细胞,辅助性T细胞可识别与其接触的抗原信号,并被激活,开始增殖

耶鲁公开课 - 生物医学工程探索课程节选