/lɒŋ; [US] lɔ:ŋ; lɔŋ/
adj (-er / -NgE(r); -N^L/, -est /-NgIst; -NgIst/)
1 having a great or specified extent in space （空间上）长的
*How long is the River Nile? 尼罗河有多长?
* Your hair is longer than mine. 你的头发比我的长.
* Is it a long way (ie far) to your house? 到你家远吗?
* These trousers are two inches too long. 这条裤子长出两英寸. Cf 参看 short1 1.
2 having a great or specified duration or extent in time （时间上）长的
*He's been ill for a long time. 他病了很长时间了.
* How long are the holidays? 假期有多长?
* They're six weeks long. 有六周之久.
* Don't be too long about it, ie Do it soonor quickly. 时间别太长（早做或快做）. =>Usage at long3用法见long3.
3 (phonetics 语音) (of vowel sounds) taking relatively more time to utter than the correspondingshort vowel sound （指元音）长音的
*The vowel sound in `caught' is long; in `cot' it is short. caught中的元音是长元音; cot中的是短元音.
4 seeming to be longer than it really is 似乎比实际为长的; 漫长的
*ten long years, miles, etc 漫长的十年、十英里等.
5 (of memory) able to recall events distant in time （指记忆）能回忆久远的.
6 (idm 习语) at the `longest not longer than the specified time （时间上）至多, 最长
*He's only away for short periods a week at the longest. 他只是短期外出--至多一周. go `far/go a long `way become very successful 很成功
*That girl will go a long way, I'm sure. 我相信那姑娘很有前途. go far/go a long way towards doing sth make a considerable contribution towards sth 对某事物大有裨益
*concessions which go a long way towards satisfying his critics 对批评他的人起缓解作用的让步
* The new legislation does not go far enough towards solving the problem. 新的法规对解决该问题并无多大帮助. go a long way
(a) (of money, food, etc) last a long time （指钱、食物等）用很长时间, 经花, 经用
*She makes a little money go a long way, ie buys many things by careful spending. 她用很少的钱能买很多东西.
* A little of this paint goes a long way, ie covers a large area. 这种颜料用一点可以涂一片.
(b) be as much as one can bear 叫人受不了
*A little of his company goes a long way, ie One can tolerate his company for a short time only. 跟他呆上一会儿就叫人受不了. happy as the day is long => happy. have come a long way have made much progress 大有进步
*We've come a long way since those early days of the project. 这项工作开始以来我们已取得很大进展. have a long `arm be able to make one's power or authority felt even at a distance 有深远的势力或影响力. in long/short pants => pants. in the `long run ultimately; eventually 从长远看; 终究; 最後
*In the long run pricesare bound to rise. 从长远看, 物价肯定要涨. in the long/ short term => term. it's as broad as it's long => broad1. (put on, have, wear, etc) a long `face sad expression 拉长脸; 哭丧着脸; 愁眉苦脸. a long `haul long and difficult activity, etc 持久而艰苦的活动等
*It's been a long haul but at last this dictionary is published. 经过千辛万苦这部词典才终于得以问世. a `long shot wild guess or attempt 瞎猜; 姑妄一试. ,long in the `tooth (joc 谑) rather old 年齿渐长; 颇老
*He's getting a bit long in the tooth to be playing football. 他踢足球未免年齿过长了. long time no `see (infml 口) (used as a greeting 用作招呼语) it's a long time since we last met 好久没见了. not by a `long chalk; Brit not by a `long shot not at all 完全不; 绝不
*We're not beaten yet, (not) by a long chalk. 我们还没有败, 远远没败. take a long (cool/hard) `look at sth consider a possibility, problem, etc carefully and at length 谨慎仔细考虑（可能性、问题等）. take the `long view consider events, effects, factors, etc a long time in the future, rather than the immediate situation 从长远考虑事情、效果、因素等. to cut a long story short to get to the point of what one is saying quickly 长话短说; 简而言之; 总之.

/lɒŋ; [US] lɔ:ŋ; lɔŋ/ n
1 [U] long time or interval (used esp as in the expressions shown) 长时间, 长间歇（尤用于以下示例）
*This won't take long. 这要不了多久.
* Will you be away for long? 你要离开很长时间吗?
* I hope to write to you before long. 我希望不久就能给你写信. =>Usage at long3 用法见long3.
2 [C] long signal (eg in Morse code); long vowel or syllable (esp in Latin verse) 长信号（如摩尔斯电码）; 长元音或长音节（尤指拉丁诗文中）
*a long and two shorts 一长两短.
3 (idm 习语) the ,long and (the) `short of it all that need be said about it; the general effect or result of it 总的意思; 总的结果.

/lɒŋ; [US] lɔ:ŋ; lɔŋ/ adv (-er / -NgE(r); -N^L/, -est /-NgIst; -NgIst/)
1 for a long time 长久; 长期地
*Were you in Rome long? 你在罗马呆的时间长吗?
* Stay as long as you like. 你愿停留多久皆可.
* long into the next century 下一个世纪之後很久
* I shan't be long, ie will come, go, etc soon. 我用不了很长时间（就来、就去等）.
2 at a time distant from a specified point of time (used esp in the expressions shown) （距某一时间）很久地（尤用于以下示例）
*long ago/before/after/since 很久以前[之前很久/之後很久/很久以来]
* He died not long (ie soon) after (that). （那之後）不久他就死了. =>Usage at recent 用法见recent.
3 (with ns indicating duration 与表示延续的名词连用) throughout the specified time 贯穿某时间
*all day long 整天
* I've waited for this moment my whole life long. 我一生都在等待这个时刻.
4 (idm 习语) as/so long as (used as a conj 用作连词)
(a) on condition that; provided that 只要; 如果
*As long as it doesn't rain we can play. 只要不下雨, 我们就能玩.
(b) (US) since; inasmuch as 既然; 由于. be not long for this world be likely to die soon 行将谢世; 历日无多. no/any/much `longer after a certain point in time 不再; 已不
*I can't wait any/much longer. 我不能再等了.
* He no longer lives here. 他已不住在这里. he who laughs last laughs longest => laugh. so long (dated infml 旧, 口) goodbye 再见.

NOTE ON USAGE 用法
*Both long and a long time are used as adverbial expressions of time. *long和a long time都用作表示时间的状语.
1 Long is not used in positive sentences unless it is modified by another adverb, eg too, enough, ago *long只在受另一副词如too、enough、ago修饰时才用于肯定句
*You've been sleeping too long/long enough. 你睡得太久了[你睡的时间够长了].
* She waited there (for) a long time. 她在那里等了很长时间.
2 Both can be used in questions 这两者均可用于疑问句
*Have you been here long/a long time? 你在这里呆了很久[很长时间]了吗?
3 In negative sentences there can be a difference in meaning. 在否定句中二者意义有别. Compare 试比较
*I haven't been here for a long time (ie It is a long time since I was last here) and I haven't been here long (ie I arrived here only a short time ago). ｀我已很久没到这里来了（即离上次我来此已很长时间了）＇和｀我到这里没多久（即我刚到不久）＇.

/lɒŋ; [US] lɔ:ŋ; lɔŋ/ v [Ipr, It] ~ for sth/~ (for sb) to do sth have an intense desire for sth; want sth very much （对某事物）渴望; 非常想有某事物
*The children are longing for the holidays. 孩子们盼望放假.
* a (much) longed-for rest 巴望着（已久）的休息
* She longed for him to ask her to dance. 她巴不得他邀请自己跳舞.
* I'm longing to see you again. 我盼望再见到你.

abbr 缩写 = longitude
*long 23E/W, ie East/West 东[西]经23. Cf 参看 lat.

long.
the written abbreviation of longitude