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。
In the complex field of human resources for health, finding accurate data and analyzing situations has proven difficult.
事实证明，在卫生人力资源这个复杂的领域，很难获得准确的数据并进行情况分析。
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。
That guiding process has proven difficult to do efficiently, especially for creating insulin-producing cells, Gearhart noted.
这个引导转化过程非常困难，尤其是对于转化成能分泌胰岛素的细胞。
Yet peace will remain elusive unless the international community can deal with the five binds that have proven difficult to escape in Afghanistan.
然而，和平仍然难以捉摸，除非国际社会能处理阿富汗无法回避的五大难题。
In recent years, reports linking vaccines to autism have been debunked, but fears of adverse events — which experts say are rare — have proven difficult to erase.
近年来，一些将疫苗同自闭症相联系的报告已被证明是错误的，专家也表示注射疫苗后很少出现不良事件，但是，人们对此所产生的恐惧却很难消除。
In recent years, reports linking vaccines to autism have been debunked, but fears of adverse events — which experts say are rare — have proven difficult to erase.
近年来，一些将疫苗同自闭症相联系的报告已被证明是错误的，专家也表示注射疫苗后很少出现不良事件，但是，人们对此所产生的恐惧却很难消除。
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