stock-in-trade
n [U]
1 everything needed for a particular trade or occupation 干某行业所需的一切.
2 (fig 比喻) words, actions, behaviour, etc commonly used, displayed, etc by a particular person 某人惯用的言辞、 手段、 作法等
Facetious remarks are part of his stock-in-trade. 讲俏皮话是他的拿手好戏.