after years of diligent research 经过多年的辛勤研究之后
I completed this subject paper with diligent research and study.
经过我的刻苦钻研和学习,我已经把这个课题做完了。
His diligent research of our Earth and solar system led to groundbreaking discoveries that, at the time, were extremely controversial.
他对于地球和太阳系的辛勤研究带来了突破性的发现,而这种发现在当时极具争议性。
Professor Huggins was diligent enough to obtain a diploma in space research.
哈金斯教授很勤奋,他获得了太空研究方面的一个文凭。
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