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

VOA: special.2009.09.07

And, you've undoubtedly heard a lot in the public press, and even in the political dialogue such as it is these days that hydrogen might be on environmentally friendly fuel.

毫无疑问你已经在公开新闻上，甚至在政治的对话上听到过了,比如最近这些天,氢气是一种环境友好的燃料。

麻省理工公开课 - 固态化学导论课程节选

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

But not everyone sees the hydrogen fuel cell bus as the hope of the future.

VOA: special.2009.09.07

The project hopes to export hydrogen fuel cell buses in the future.

VOA: special.2009.09.07

Hydrogen fuel cell buses cost more than traditional buses.

VOA: special.2009.09.07

He said technicians are confident that they have fixed the hydrogen leak, which was found while NASA crews were filling the shuttle's external fuel tank.

VOA: standard.2009.06.16