这些形容词均含有“勇敢的”之意。
bold : 侧重指面对困难或危险时勇往直前，勇于进取的勇敢精神。
- She was a bold and fearless climber.
她是一位勇敢无畏的登山者。 - The newspaper made the bold move/took the bold step of publishing the names of the men involved.
该报采取大胆行动，将有关人员的名字都公布了出来。
brave : 含义广泛，指天生的勇敢，无所畏惧地面对困难与危险，侧重胆识与果断。
- a brave soldier
勇敢的士兵 - It was a brave decision to quit her job and start her own business.
她辞职自己创业是个大胆的决定。 - She was very brave to learn to ski at 50.
她50岁开始学滑雪可真勇敢。 - Of the three organizations criticized, only one was brave enough to face the press.
三家受到批评的机构中，只有一家敢于面对媒体。 - Richards has made a brave attempt to answer his critics.
理查德兹勇敢地回应那些批评他的人。 - This action will cause problems, despite the bank's brave talk/words about carrying on as if nothing had happened.
尽管银行貌似若无其事，大言不惭地说要坚持下去，这种行为还是会产生问题。
courageous : 正式用词，侧重指在一切情况下都有胆量，无所畏惧，强调基于道德信念，经深思熟虑后所产生的勇敢。
- It was a courageous decision to resign in protest at the company's pollution record.
以辞职来抗议公司污染环境的劣迹是一个勇敢的决定。 - It was courageous of her to challenge the managing director's decision.
她真有勇气，敢于反对总经理的决定。
daring : 强调面临意外或危险时胆大心细，头脑冷静。褒义贬义均可用，贬义指胆大妄为。
- a daring escape
大胆的逃亡 - This is a daring new film (= one willing to risk criticism) by one of our most original modern directors.
这是一部相当大胆的新片，执导者是很有创意的现代导演之一。 - She was wearing a fairly daring (= short) skirt that barely covered her bottom.
她的穿着非常大胆，短短的裙子刚刚能够遮住臀部。
heroic : 正式用词，多指在战争或重大危险时，为他人为事业忘我献身的英雄气概。
- a heroic act/deed
英勇的行为／英雄事迹 - a heroic figure
英雄人物 - Rescuers made heroic efforts to save the crew.
救援人员不畏艰险努力营救全体船员。 - We watched our team's heroic struggle to win back the cup.
我们目睹了我队为赢回奖杯所作的不懈努力。
fearless : 语气肯定，侧重在危险时无所畏惧，毫无动摇。
- a fearless fighter
无畏的斗士 - Fearlessness stems from selflessness.; Only the selfless can be fearless.
无私故能无畏。 - To go in for technical innovation, one must have the fearless spirit of a pathbreaker.
搞技术革新就要有一股不怕困难的闯劲。
