tā / wèi le / xiě hǎo / zhè / piān / lùn wén / ǒu xīn lì xuè / áo / le / wú shù / gè / yè wǎn

他为了写好这篇论文，呕心沥血，熬了无数个夜晚。

He worked his heart out writing this paper, staying up countless nights.