这是一种倍增太阳能电力的便宜方法；不用制造很多昂贵的太阳能电池板，使用相对便宜的镜子，你就可以得到相同数量的电。

It's a cheap way to multiply solar power; instead of producing lots of expensive PV panels, you can get the same amount of electricity with relatively cheap mirrors.

youdao

今天，我们离这个目标还远着：相对于便宜的化石燃料来说，大肆宣传的科技，如风能和太阳能，仍然是非常昂贵和低效的。

We are far from that point today: much-hyped technologies such as wind and solar energy remain very expensive and inefficient compared with cheap fossil fuels.

youdao

目前，太阳能降温设备是很昂贵的。

At present solar-cooling equipment is expensive.

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