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。

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。

a cock-and-bull story荒诞的故事，无稽之谈

a story or explanation which is obviously not true.

She told me some cock-and-bull story about her car breaking down.

她给我讲的车如何坏掉的事情非常荒诞。

John Bull约翰牛，英国佬

a character who represents a typical English man or the English people.

“约翰牛”是英国人的绰号。19世纪的著名作家狄更斯就曾引用过。随着时间的推移，“约翰牛”的形象发生了耐人寻味的变化，由最初那个身强力壮、满脸横肉的中年船长想象，变成了一个年过半百、五短身材的矮胖子。于是漫画上出现的“约翰牛”，是个头戴宽边礼帽，足蹬翻口皮鞋，身穿茄克衫的绅士摸样。当年那种杀气腾腾的气概收敛不少，其原来的贬义似乎变成了褒义。“约翰牛”逐渐变成了一位饱经事故的实干家形象，他的行为成了英国的人的标准行为。这样一来，John bull这个成语就成了英国人或者英国的代名词了；而与之相关的John Bullism就指“英国精神”“英国习气”或“英国人的典型性格”，John Bullist则常指“英国迷”。

In the cartoon, John Bull appears as a short, stocky figure wearing a waistcoat with the British flag on.

在漫画中，“约翰牛”常以矮小健壮的形象出现，身穿印有英国国旗的背心。

Take the bull by the horns：遇到困难情形果断做出决定，当机立断

We'll have to take the bull by the horns and tackle the Medicare question.

我们必须当机立断，想办法解决医疗保险问题。

shoot the bull：惬意轻松聊天，随聊

We sat out on the porch until late, just shooting the bull.

我们在走廊外坐到很晚，随便聊了聊。

bull session: 漫谈，自由讨论

Some students of the economics department had a bull session last Sunday.

上星期天，经济系的一些学生聚集在一起漫谈。

Till the cows come home：很久，无限期

从前乳牛未经人工改造，每年都有不产奶时期。在产奶时期，它们乳房充盈，不挤奶会很不舒服，自然会主动回家给人挤奶；但是，在不产奶时期，要它们主动回家，真不知要等多久了。所以，till the cows come home有“很久”、“无限期”的意思。

:He is very long-winded and will keep on talking till the cows come home

他是个话篓子，会说个不停的。

holy cow: 对某事表示惊讶, 惊奇, 愤怒等.

"A friend of mine is in Hollywood filming a movie this month." "Holy cow, that must be so cool."

“我的一个朋友这个月正在好莱坞拍电影。”“天哪，这太酷了！”

as awkward as a cow on roller skates：非常笨拙，笨手笨脚.

The little girl was as awkward as a cow on roller skates when she first began riding her bicycle.

这个小女孩刚骑自行车的时候笨手笨脚

milk the bull: 做徒劳无功的事，缘木求鱼

Susan tried everything to train her daughter into a lady, but it seems that she is milking the bull.

苏姗千方百计想把她女儿训练成个淑女，可这些似乎都是徒劳。

as dumb as an ox沉默不语

He was as dumb as an ox in the meeting. 开会时他沉默不语。

play the giddy ox：胡闹，干蠢事

Don’t you play the giddy ox with me！你们别跟我耍赖撒疯!

throw /shoot the bull：吹牛，夸张

He likes to throw the bull. 他喜欢吹牛