As all the energy on earth come from the sun, it makes sense that solar cell and fuel cell are hot today.

我们知道，地球上所有的能源都来自太阳，这也是为什么今天太阳能电池和燃料电池受到关注的原因之一。

youdao

The reason that businesses are in the fuel-cell race today is simple: the hope of cleaner and more efficient products points to higher profits.

ECONOMIST: Stepping on the gas

And in buses on the U.S.' West Coast, we're testing hydrogen fuel-cell engines, designed to replace today's oil-burning engines.

FORBES: Falling in love