同时，光伏行业慢慢的取代了市场，2007年里面，世界光伏的安装量达到了9.2GW.尽管每度电很贵。

In the meantime, solar-photovoltaic technology slowly took over the market, and by 2007 worldwide installed capacity reached 9.2GW.

youdao

但是电和电池都很贵，而且非洲的一些地方很难买到，所以他发明了一个能够不用电池和电力的小电台。

Electricity and batteries are expensive and hard to get in some parts of Africa, so he developed a clever radio that works without batteries or electricity.

youdao

但是电和电池都很贵，而且非洲的一些地方很难买到，所以他发明了一个能够不用电池和电力的小电台。

Electricity and batteries are expensive and hard to get in some parts of Africa, so he developed a clever radio that works without batteries or electricity.

youdao