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If you say that someone has an ulterior motive for doing something, you believe that they have a hidden reason for doing it.
Sheila had an ulterior motive for trying to help Stan.
希拉设法帮助斯坦是别有用心。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。