The medical establishment was very suspicious of the young upstart.医疗权威们对这个自命不凡的年轻新手不放心。What an arrogant little upstart!多么傲慢狂妄的小新贵！He dreaded their upstart ambition.他惧怕他们的狂妄野心。Many prefer a familiar authority figure to a young upstart.很多人都更愿意跟自己熟悉的权威人物打交道，而不喜欢一个年纪轻轻却傲慢无礼的家伙。