mindmap root((怒容)) frown implies a stern face and contracted brows that express concentration, bewilderment, anger, displeasure, or contempt: the teachers ~ed on my boyish pranks. scowl suggests a similar expression that conveys bad humor, sullenness, or resentful puzzlement: a grumpy old man who ~ed habitually. glower implies a direct defiant brooding stare or glare as in contempt or defiance: the natives merely ~ed at the invading tourists.（brood这里指一直盯着或瞪着，原意是母鸡孕育小鸡，一窝小鸡，比喻长期怀有想法，如he brooded over his dead mother他对已故母亲念念不忘，如for years he brooded vengeance/suicide多年来他一直在盘算报仇/自杀，如a brood of chicks一窝小鸡，可用于人，如a mother and her brood母亲和一窝孩子，如a remarkable brood of writers几位优秀作家） glower原意是stare凝视盯，但现在主要表示glare瞪了 lower suggests a menacing darkness or gloomy anger and refers either to persons OR to skies that promise bad weather: ~ed as he went about his work, never uttering a word.