Apple fans and enthusiasts were eager to finally purchase an iPad,a tablet computer with a touch-screen that Apple claims will "bridge the gap" between a cell phone and a laptop computer.

VOA: standard.2010.04.03

This is a mechanism by which an electrical signal comes here, it gets translated into a chemical signal, the chemical diffuses across the gap and reinitiates a - an electrical signal in the next cell and that's one way that it happens.

这就是电信号产生的机理,电信号翻译成化学信号,化学物质扩散过突触间隙,重新激起下个细胞中的电信号,这是一种方式

耶鲁公开课 - 生物医学工程探索课程节选