like a red rag to a bull：使人愤怒的, 令人极端烦恼的
　　if a statement or an action is like a red rag to a bull, it makes someone very angry.
　　For Claire, the suggestion of a women-only committee was like a red rag to a bull.
　　设立仅有女性的委员会的提议彻底激怒了克莱尔。
　　hit a bull’s eye:命中靶心，达到预定目标，取得成功.
　　In target shooting: a score made by hitting the center of the target
　　He hit a bull’s eye in their argument with that witty retort.
　　他以机智的反驳赢得了辩论胜利。来源：www.examda.com
　　bull-headed：固执的，任性的，一根筋
　　someone who is bull-headed is determined to do exactly what they want to do, and does not think about what other people want.
　　He's completely bull-headed. I asked him not to throw out that old table, but he did it anyway.
　　他太固执了。我告诉他不要扔了那个旧桌子，但他到底还是扔了。
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