从极热的而干燥的岩石中提取热量，暴露出了一个更加困难的问题：必须击碎岩石以保证水的循环，而水必须是人工提供的。
Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.
尽管铁路的名声对升级工程的推进，它的进程也暴露出其潜在的问题。
Although the upgrade was prompted by rail's popularity, its progress reveals some underlying problems too.
在我们的访谈期间，现有的处理过程暴露出一个重大的问题。
A significant problem was exposed with the existing process during our interviews.
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