Generating enough light could be prohibitively expensive, unless cheap, renewable energy is available, and this appears to be rather a future aspiration than a likelihood for the near future.

除非有廉价可再生能源，否则制造足够光的成本可能会高得令人望而却步，而这似乎只是未来的愿望而非近期能实现的。

youdao

It can't be cheap. It must be expensive.

它不会便宜。一定价格昂贵。

youdao

Some metrics can be considered “free” (or “ignorably cheap”), while others can be quite expensive to gather.

一些数据的测量可以被认为“无干扰”（或“忽略不计”），然而另外一些数据的测量可称得上代价昂贵。

youdao

The shutdown is bad news for the recession-hit country partly because it will lose a source of cheap electricity and be forced to import more expensive energy.

VOA: standard.2010.01.01

The latter move was particularly eye-opening: building a nuclear plant is supposed to be the expensive part, while operation is expected to be relatively cheap.

FORBES: New Centralized Nuclear Plants: Still an Investment Worth Making?

Essential oils cannot be patented and are cheap and heat-processed ginseng is already patented and expensive (although similar results may be attained by steaming ginseng for three hours).

FORBES: What Can You Do When Your Aging Parent Has Dementia?

F2P games often present players with massively expensive items in game-economy terms that can be purchased relatively cheap with real world money.

FORBES: David Brevik: 'Marvel Heroes' Will Be Truly Free-To-Play