during the past 3 years=in the last 3 years（现在完成时） in the pa

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during the past 3 years=in the last 3 years（现在完成时） in the past、last 15 years
1.during the past 3 years=in the last 3 years（现在完成时）
2.in the past、last 15 years
我需要上面两个知识点的解析（区别）、例句,全面且简洁

意思其实差不多,就是所接时态不一样,during+时间段多数跟过去时连用,in+时间段则与完成时连用；这个知识点多数在单选出现,迷惑性挺高的.
例句：
1.During the past 3 years,the competition between the local and foreign banks spread in many field,and become more and more .
入世三年来,中外银行在各个领域展开了业务的竞争,而且这种竞争还有愈演愈烈之势.
2.Many new materials and technology have been designed in the last 15 years.
在过去的15年中有许多新型材料和技术问世.
In the past 15 years,innate immunity has come into its own.
过去15年来,先天性免疫逐渐受到重视.

during the past 3 years=in the last 3 years（现在完成时） in the pa in the last two years/during the last two years/in the past in the past few years 过去完成时 in the last few years 现在完成时 in t in the past 16 years in the last 16 years During the past two years与in the past two years区别 in the past...years只用于现在完成时吗? 谢谢 in the past...years只用于现在完成时吗? in the past three years是用过去完成时还是现在完成时? in the past two years In the past three years in the past few years in the past 100 years