And this would sit on your belt. So it would sit like this and there would be batteries that you could either put in a fanny pack or there are all kinds of jackets you could wear in order to support the batteries,"

VOA: standard.2010.01.27

Make sure you have batteries that are in a good state of charge in your calculator.

确保你的计算器电池,处在一个良好的状态。

麻省理工公开课 - 固态化学导论课程节选