... 很久以前 a very long time ago 年复一年 continuously for many years 一年一年地 progressively each year ...
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The authors have been engaged in field research continuously for many years, 30 years in the case of the first author.
这些作者连续多年都在从事野外研究工作；就第一位作者而言，时间则长达30年之久。
For many years, the people in exploration dust government method continuously reduce the dust, the improvement work environment, but the effect is not very ideal.
许多年来，人们一直在探索粉尘治理的妙方，以寻求降低粉尘、改善作业环境，但效果不很理想。
For many years he continuously concentrates on study of western tradition oil painting art.
多年来一直在对西方传统油画艺术进行潜心研究。
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