mainspring
noun [ C usually singular ] formal uk/ˈmeɪn.sprɪŋ/ us/ˈmeɪn.sprɪŋ/
主要原因；主要动力
the most important reason for something; the thing that makes something else happen
Work was the mainspring of his life. 工作是他生活的主要动力。
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。