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

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

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