四年的学习使我对这个领域有了深入的了解的翻译：Four years of study I have in-depth understanding in this area 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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Four years of study I have in-depth understanding in this area

Four years study enable me to have the thorough understanding to this domain

4 years of learning to enable me to have an in-depth understanding of this area

Four years of study I have in-depth understanding in this area