mainspring disc条盘
alarm mainspring闹钟发条
mainspring gauge发条尺寸
mainspring g发条
mainspring hook[仪] 发条钩;主发条钩
mainspring winder[仪] 发条卷线器;主发条卷线器;发条缠绕器
mainspring wheel发条轮
mainspring punch发条冲
Standard-csed Mainspring标准条盒发条
N-COUNT（可数名词） If you say that an idea, emotion, or other factor is the mainspring of something, you mean that it is the most important reason or motive for that thing. 主要部分 [书面][usu sing, usu 'the' N 'of' n]
My life has been music, and a constant search for it has been the mainspring of my life.
我为音乐而生，对音乐的不懈探索已经成为我生活的动力。