The bus uses a hybrid system that combines the hydrogen fuel cells with high power batteries.

VOA: special.2009.09.07

So, people are talking about the use of hydrogen in fuel cells.

人们在讨论,如何把氢用在燃料电池中。

麻省理工公开课 - 固态化学导论课程节选

The cells created electricity by mixing hydrogen with oxygen.

VOA: special.2009.06.24