strong suit
noun
1- (in bridge or whist) a holding of a number of high cards of one suit in a hand（桥牌或惠斯特牌）同花大牌, 长套。
1.1
- a desirable quality that is particularly prominent in someone's character or an activity at which they excel特长, 专长：
compassion is not Jack's strong suit.
怜悯之心不是杰克的长处。