Thee pioneers are courageous indeed, overcoming one difficulty after another.
这些开拓者的确有勇气，他们克服了一个又一个的困难。
The medical workers overcame one difficulty after another in their long-term quest for the disease.
在为治疗这种疾病而进行的长期探索中，医疗工作者克服了一个又一个困难。
The medical workers overcame one difficulty after another in their long-term quest for the disease.
在为治疗这种疾病而进行的长期探索中，医疗工作者克服了一个又一个困难。
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