adj (1)长的(measuring a great or specified distance from one end to the other)：go on a～journey 长途旅行;a～rope/road/river 一根长绳/一条长长的路/一条大河;～legs/arms/hair 长腿/臂/发;These trousers are not～enough for me. 这条裤子我穿不够长。The room is five metres～.这个房间长五米。How～is the Great Wall of China?长城有多长?～johns 长内衣裤;a～jump 跳远; ～wave 长波;〖反〗short;
 (2)时间长的(having or using a great or specified period of time)：a～conversation/discussion/speech 长时间的交谈/讨论/演讲;wait for a～time 等很长的时间;There was a～delay before the plane took off.飞机起飞前耽搁了很长时间。How～is the summer vacation?It's seven weeks～. 暑假有多长?有七个星期长。The film is two hours～. 这部电影两小时长。〖反〗short;
 (3)感觉漫长的(seeming or feeling to measure a greater distance in space or time than usual)：It's been a very～day. 这是漫长的一天。It was a～day at work because I had very little to do. 因为没有什么事可做，那个工作日显得很长。Due to the wind and rain，it was a very～three miles into town. 由于刮风下雨，进城去的三英里路显得很漫长。wait for a～hour 足足等了一个小时;
 at (the) longest 最长，至多：We can wait only two days at the～est. 我们最多只能等两天。
 (not) by a long chalk/shot 远(没有)：He has not finished his work by a～chalk. 他远没有完成他的工作。
 go a long way 1)大有作为：The boy will go a～way，I am sure. 我肯定这个男孩会大有作为的。2)很有助于：The new plan will go a～way towards solving the housing problem. 这项新计划将很有助于解决住房问题。3)禁用(花)：With some children，small sums go a～way. 有些小孩一点点钱可以花很长时间。4)叫人受不了：A little of her company goes a～way. 跟她待上一会儿就叫人受不了。
 come a long way 有了很大的改善(进展)：The school has come a～way since its beginning. 这所学校从建校初期到现在有了很大的发展。
 in the long run 从长远来看(说)：It is their only hope of survival in the～run. 从长远来看那是他们生存的唯一希望。
 (have/put on/pull/wear) a long face 哭丧着脸，显出沮丧的样子：Don't pull a～face when I tell you to go to bed. 我让你去睡觉你不要不高兴。
 take a long look at 仔细考虑：Take a～look at the cold facts before cutting defence spending. 在削减国防经费之前，要仔细考虑一下严酷的现实。
 take the long view 从长远考虑，目光远大：Those who took the～view are now reaping the benefit of such a policy. 那些目光远大的人现在得到这种政策的好处了。
 to cut a long story short 长话短说，简言之：To cut a～story short，I decided to turn down the job. 简言之，我决定拒绝这份工作。
 →͵long-′distance adj & adv 长途的(地);͵long-′lived adj 长寿的;′long-range adj 长期的，远程的;͵long-′sighted adj 远视的，有远见的;͵long-′term adj 长期的;͵long-′winded adj 喋喋不休的，冗长而令人生厌的;
 adv (1)长期(久，时间)地(for a long time)：wait/stay～等/待很长时间;L～live ...!……万岁!I have lived～enough. 我年纪已经够大的了。He has～wanted to write a book. 他早就想写一本书了。
 (2)早在或以后很久(at a much earlier or a much later time than indicated)[无comp]：～after midnight/World War II 下半夜/二次世界大战后很久;～before the war/before sb was born 早在战前/某人出生前很久;～ago 很久以前;～since 很久以来;
 (3)始终(from the beginning to the end)：all day/night～整天/夜;one's whole life～一辈子;all summer/winter～整个夏天/冬天;
 as/so long as 只要……就：You may borrow the book as～as you keep it clean. 只要你不把它弄赃，就可以借这本书。
 no longer (not any longer)不再：I can't wait any～er. 我不能再等了。He's no～er fit to be a member of this club. 他不再适合作这个俱乐部的成员了。
 so long 再见(infml)͵
 n (1)长时间(a long time)[U]：It will not take～. 这不需要很长时间。He didn't speak for～. 他没有讲很长时间。
 (2)长音(信号)(syllable，signal of long duration)[C]：four～s and six shorts 四个长音和六个短音;The signal was two～s and a short. 信号是两长一短。
 before long 很快，不久：Come in and wait—he'll be back before～. 进来等一等，他很快就会回来。
 the long and (the) short of it 要点，总之：The～and the short of it is that you must pay me the money. 总而言之，你必须付给我钱。
 →͵long-drawn-′out adj 拖(拉)长的;͵long-′standing adj 长期的，由来已久的;lon′gevity n 长寿;′longitude n 经线(度);
 【用法】long和a long time都作时间状语。long只在被too，enough，ago等另一副词修饰时才用于肯定句。两者都可用于疑问句。在否定句中，两者在意思上有区别。试比较：He hasn't been here for a long time.(他好久没有到这里来了。)He hasn't been here long.(他到这里没有多久。)