the usual suspects idiom
意料中会出现的人;经常做某事的人
the people or things you would expect to be present somewhere or doing a particular thing
His heart attack was caused by the usual suspects: poor diet, stress, and smoking. 导致他心脏病发作的原因并不出乎意料：不良饮食习惯、精神紧张、吸烟。