◙ noun 1. a shaped covering for the head worn for warmth, as a fashion item, or as part of a uniform • 帽子 used to refer to a particular role or occupation of someone who has more than one • （有多种职务或职业者的）职务，头衔 »wearing her scientific hat she is director of a pharmacology research group. 作为科学家，她同时又是一个药理学研究组的主任。
【IDIOMS】
◘ be all hat and no cattle 1. [US informal] tend to talk boastfully without acting on one's words • [美，非正式] 空谈，夸夸其谈 ◘ black hat (或 white hat) 1. used in reference to the bad (or good) party in a situation (from the colour of hat traditionally worn by the bad (or good) character in Western films) • ［用于指西部片场景中可通过帽子颜色判断出来的坏人或好人］黑帽（或白帽） »we are the good guys—the black hats lost. 我们是那些好人——黑帽子坏人输了。 ◘ hats off to —— 1. used to express admiration for someone who has achieved something or done something praiseworthy • 向…致敬 »hats off to them for agreeing to work for the day to raise money. 向同意在筹款日参加工作的人们致敬。 ◘ keep something under one's hat 1. keep something a secret • 将…保密 ◘ pass the hat round (或北美 1. collect contributions of money from a number of people for a specific purpose • 筹集钱款 ◘ pick something out of a hat 1. select something, especially the winner of a contest, at random • 随机挑出（尤指比赛中的获胜者） ◘ take one's hat off to 1. used to state one's admiration for (someone who has achieved something) • 向 （取得成就之人）…致敬（或表示钦佩） ◘ throw one's hat in or into the ring 1. express willingness to take up a challenge • 欣然迎战，接受挑战