David Harrison and Gregory Anderson of Living Tongues say that many endangered languages are spoken by native cultures in close contact with the natural world.

VOA: special.2009.12.02

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

The three have allegedly been in contact with each other and, in monitored phone conversations, were said to have been aware they were being watched by U.S.authorities.

VOA: standard.2009.09.20

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

Iranian intellectuals and opposition activists remain in contact with each other and with the outside world by posting comments and information about their activities on Web sites both inside and outside Iran.

VOA: standard.2009.11.14