區別是：be excellent in 強調“在某方面全面出色”。be excellent at強調“在某一點上單方面出色”，或“精通於某一點”。例句辨析：be excellent in
1、In short, DVD to MP4 Converter is easy to use, fast in speed and excellent inquality.在短期內，DVD到的MP4轉換器是易於使用，速度快的速度和優良的品質。
2、Almost all of the technical team members of the company are excellent in COBOLprogramming. 該公司的幾乎所有技術團隊成員在COBOL程式設計方面都非常優秀。
3、Cylinder head made of aluminum alloy, which is light-weight and excellent in heatradiation. 氣缸蓋採用鋁合金材料製成，具有重量輕，重量和散熱良好。be excellent at1、It"s possible to be excellent at anything, but nothing valuable comes easy and discomfort is part of growth. 你可能出色地做到任何事，但記住，成功來之不易，挫折也是成長的一部分。2、Some students learn best phonetically, and would be excellent at phonetic languages like English and German but miserable with Chinese. 有些學生傾向以語音學習語文，因此他們能夠很好地掌握以音節為主的語文如英文和德文，而面對華文時卻如臨大敵。3、They want to be excellent at everything they do, as mother, daughter, wife,girlfriend, professional and volunteer. 她們希望在各方面都做得優秀，無論是作為母親、女兒、妻子、女友、職場人士還是志願者。
區別是：be excellent in 強調“在某方面全面出色”。be excellent at強調“在某一點上單方面出色”，或“精通於某一點”。例句辨析：be excellent in
1、In short, DVD to MP4 Converter is easy to use, fast in speed and excellent inquality.在短期內，DVD到的MP4轉換器是易於使用，速度快的速度和優良的品質。
2、Almost all of the technical team members of the company are excellent in COBOLprogramming. 該公司的幾乎所有技術團隊成員在COBOL程式設計方面都非常優秀。
3、Cylinder head made of aluminum alloy, which is light-weight and excellent in heatradiation. 氣缸蓋採用鋁合金材料製成，具有重量輕，重量和散熱良好。be excellent at1、It"s possible to be excellent at anything, but nothing valuable comes easy and discomfort is part of growth. 你可能出色地做到任何事，但記住，成功來之不易，挫折也是成長的一部分。2、Some students learn best phonetically, and would be excellent at phonetic languages like English and German but miserable with Chinese. 有些學生傾向以語音學習語文，因此他們能夠很好地掌握以音節為主的語文如英文和德文，而面對華文時卻如臨大敵。3、They want to be excellent at everything they do, as mother, daughter, wife,girlfriend, professional and volunteer. 她們希望在各方面都做得優秀，無論是作為母親、女兒、妻子、女友、職場人士還是志願者。