"by trade" in Chinese (Traditional)
職業上
Definition
用來表示某人的主要職業，尤其是和現在做的事不同時。
Usage Notes (Chinese (Traditional))
通常用在職業名稱後面，有時比較正式，強調原職業背景，尤其和現在不同時。
Examples
She is a doctor by trade.
她**職業上**是醫生。
My father is a mechanic by trade.
我父親**職業上**是機械師。
He became a teacher, but he is an artist by trade.
他後來當了老師，但**職業上**是藝術家。
I'm a scientist by trade, but these days I work in sales.
我**職業上**是科學家，但現在做業務。
You’d never guess he’s an engineer by trade after seeing his paintings!
看到他的畫後，你絕對想不到他**職業上**是工程師！
Most of us are writers by trade, but some also dabble in photography.
我們大多數人**職業上**是作家，但有些人也玩攝影。