by choice

出于自愿

例句与用法：

He has grown interested in graphic education first by force of circumstance but later by choice.

开始由于形势所迫，但后来出于自己的选择，他逐渐对书画教育感兴趣起来。

详细释义：

出于自择

He is a mechanic by profession, and a painter, by choice.

从职业上说, 他是机械师, 从爱好上说, 他是画家。