Financial problems and voter registration issues, particularly issues of nationality and voter eligibility, have already prompted Ivory Coast to push back the election several times since current President Gbagbo's mandate ran out in October 2005.

VOA: standard.2009.09.29

Because there are ions moving back and forth, there's a current that flows and there's a electrical potential that's generated.

由于离子的进进出出,就产生了电流流动,并且形成了电势差

耶鲁公开课 - 生物医学工程探索课程节选

Because there are ions moving back and forth, there's a current that flows and there's a electrical potential that's generated.

由于离子的进进出出,就产生了电流流动,并且形成了电势差

耶鲁公开课 - 生物医学工程探索课程节选