词典释义：
either of two equal or corresponding parts into which something is or can be divided
半，一半
-
two and a half years 两年半
-
the northern half of the island 岛的北半部
-
divided in half 分成两半
-
reduced by half .减少了一半。
either of two equal periods of time into which a sports game or a performance is divided
（体育比赛或表演的）半场，半时，半局。
〈英，非正式〉 （啤酒等的）半品脱
-
a half of bitter .半品脱苦啤酒。
〈非正式〉 （尤指儿童的）半（价）票。
【高尔夫】 一穴击球得分与对手相等。
short for
<Bold>HALFBACK</Bold>的简称。
an amount equal to a half
半；一半（的）
-
[as predeterminer]
half an hour 半小时
-
almost half the children turned up 几乎有一半孩子来了
-
[as pronoun]
half of the lectures are delivered by him 这些讲座有一半是他做的
-
[as adj.]
the last half century .后半个世纪。
amounting to a part thought of as roughly a half
（数量）大致到一半的，近半的
-
[as predeterminer]
half the audience were blubbing away 近半观众在不停地哭泣
-
[as pronoun]
half of them are gatecrashers .他们中差不多有一半是不请自来的。
to the extent of half
以半的数量；到一半的程度
-
the glass was half full .杯子装得半满。
[often in combination]to a certain extent; partly
在某种程度上；部分地
-
the chicken is half-cooked .鸡煮得半熟。
-
a — and a half informal used to indicate that one considers a particular person or thing to be an impressive example of their kind 〈非正式〉 非常出色的，非一般的，典范的Aunt Edie was a woman and a half ． 伊迪姑姑是女人中的典范 -
at half cock 见HALF-COCK ．half the battle 见BATTLE ．half a chance informal the slightest opportunity 〈非正式〉 一点点机会，很小的机会given half a chance he can make anything work ． 只要给他一点点机会，他什么都可以做到 -
half an eye 见EYE ．the half of it ［usu． with negative］informal the most important part or aspect of something 〈非正式〉 最重要的一部分（或一方面）you don't know the half of it ． 你还不了解最重要的情况 -
half one （two 等） informal way of sayinghalf past one （two , etc．） 〈非正式〉 同half past one （two 等）．half past one （two 等） thirty minutes after one （two, etc.） o'clock 一（或两、三等等）点半 -
half the time 见TIME ．not do things by halves do things thoroughly or extravagantly 彻底地做事情；大肆铺张地做事情 -
not half 1 not nearly 远非，相差甚远he is not half such a fool as they thought ． 他远非他们认为的那么傻 -
2 informal not at all 〈非正式〉 一点也不，毫不the players are not half bad ． 球员们一点也不差 -
3 Brit． informal to an extreme degree； very much so 〈英，非正式〉 非常，极度地she didn't half flare up ! 她大发雷霆 -
too — by half used to emphasize something bad 太， 过于the idea seems too superstitious by half ． 这个想法似乎过于迷信
-
half an hour 半小时
真题例句：
-
half a century 半个世纪
真题例句：
-
half price 半价
真题例句：
-
in half 一半
真题例句：
"Old English half, healf, of Germanic origin； related to Dutch
