In the past this process of transition has often proven difficult.
在过去，这种转变过程常证明是艰难的。
Reducing demand has proven difficult.
事实证明，降低需求非常困难。
But finding nascent massive stars has proven difficult.
但找到新生的巨型恒星很不容易。
Someone who makes a wise judgment about something that has previously proven difficult to resolve.
某人对先前难以解决的事情做出了睿智的了断。
Someone who makes a wise judgment about something that has previously proven difficult to resolve.
某人对先前难以解决的事情做出了睿智的了断。
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