一句话翻译,要质量

he is not clever,but he is the human who has strong and persevering,through unremitting effort, finally,he obtained the outstanding achivement when he graduated.
我也是很认真的回答你的问题的，也许是我的水平太糟糕了，自己觉得怎么翻译好，便自己翻译一下不是更好。

He isn't clever, but he is a strong and persevering person, obtained the excellent achievement while graduating at last through untiring efforts.

Tough not being smart,he was a man of persistance and perseverance.And that's what led him to outstanding achievments when he graduated.

He isn't intelligent, but he is the human who strong and perseveres, through unremitting diligently finally when graduation has obtained the outstanding result.

He is not intelligent, but he is the human who strong and perseveres, through unremitting diligently finally when graduation has made the outstanding progress.