Which Green Energy Source Is the Best?

哪一种绿色能源才是最好的？

The United States expends a lot of energy studying green energy.

美国花费大量能源研究绿色能源。

Instead, make green energy so cheap that everybody wants to use it.

而如果降低绿色能源的价格，所有人就都想使用它了。

And new challenges for lithium batteries are opening up in green energy.

在绿色能源中，锂电池也受到了新的挑战。

Mrs Merkel has whetted Germany's appetite for cheap, secure, green energy.

默克尔已经将德国人对低廉、安全、绿色能源的胃口吊了起来。