例句： Their opinions on art are simply for the birds.
他們對藝術的見解真是荒唐可笑。
beat it 叫人 " 走開 " 的 口語 ，和 "Be off! 差不多，不過比后者更流行。
例句： He kept on bothering me, so I told him to beat it.
他不停地煩我，因此我叫他走開。

beat ones brains (out) 　指做事困難， " 傷透了腦筋 "
例句： I beat my brains (out) to get a job.
為了找尋工作，我傷透了腦筋。
beat sb to the draw 　搶先某人行動

例句： Mary wanted to buy that painting by Picasso, but another millionaire beat her to the draw.
瑪麗想買畢加索的那幅畫，不過另一個百萬富翁捷足先登了。
beat someone by miles 　遠強于某人
例句： When it comes to fishing, I beat him by miles.
講到釣魚，我比他棒得多。

beef 口語上常用來指 " 抱怨 " 或 " 發(fā)牢騷 " ;作動詞時后面跟 about.
例句： Tell me what's your beef-
你抱怨什么-

before you know it 口語為 " 很快 " 。
例句： I come back before you know it.來源：考試大
我很快就會回來。

behave yourself 　勸人要有禮貌和行為檢點，意思相同的口語還有 "Watch you manner.""Watch your P's and Q's". 和 "Don't get fresh."
例句： Please behave yourself before the guests.
在賓客之前你檢點一些。

behind bars 　坐牢
例句： The judge will put him behind bars for at least two years. 法官最低限度也會判他坐兩年牢。
behind the scenes ( behind the curtain )　 幕后

例句： He is the man behind the scenes.
他是幕后人物。
between ourselves 秘密地說

例句： Between ourselves, there are no secrets.
咱們私下說說，沒什么秘密。
beyond the seas 在國外，在海外

例句： He had a good time when he was beyond the seas.
他在國外時曾過得很快活。
butt in 　插手，介入

例句： Pardon me for butting in on your conversation, but this is important.
請原諒我打斷了你們的談話，不過這件事非常重要。
by and large 　大體上，總的看來

例句： I cannot totally take your point ， but by and large I think yours is reasonable.
我不能完全同意你的觀點，但大體上你的觀點是有道理的。