Although research into solar power has come a long way, sunset still poses a problem.

尽管对太阳能的研究已经走过了很长一段路，但日落后依然是一个问题。

youdao

Although research into solar power has come a long way, sunset still poses a problem.

尽管对太阳能的研究已经走过了很长一段路，但日落后依然是一个问题。

youdao