In the past few years,this young scientist has made great a------ in his research

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In the past few years,this young scientist has made great a------ in his research
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In the past few years,this young scientist has made great a------ in his research
In the past few years,this young scientist has made great a------ in his research

In the past few years,this young scientist has made great a------ in his research
achievements

difference~~~make a difference 是做出贡献的意思