So if you start and end at the same place, they've got end at the same place that they started.

所以如果你开始和结束于同一个位置，它们最终的状态与开始时会是一样的。

麻省理工公开课 - 热力学与动力学课程节选

Rather than by forming an image or a picture you put electrodes on the surface of the body and measure the electrical potential as a function of position on the body.

它并不对人进行直接的造影,而是将电极放到身体表面,通过测量该位置电势能,表征该部位的生理状态

耶鲁公开课 - 生物医学工程探索课程节选