a.

1. 长的；远的
   The railway is 1000 miles long.

   这条铁路长一千英里。

2. 长久的
   She was abroad for a long time.

   她在国外呆了很久。

3. 冗长的；过久的
   He gave a long, tiring report.

   他的报告冗长，令人厌倦。

4. （记忆力）能记得久远的
   She had a long memory.

   她记性很好。

5. 希望渺茫的
6. 【语】长音的

ad.

1. 长久地
   You can keep my book as long as you like.

   我的书你要借多久都随你的便。

2. 始终
   She worked all day long.

   她工作了一整天。

n.

1. 长时间；长时期[U]
   I am not going away for long.

   我离开的时间不会太长。

2. 【语】长音节[C]
3. 长裤[P]

vi.

1. 渴望[+to-v][（+for/after）]
   He longs for/after fame.

   他渴望成名。

   She longed to return home.

   她极想回家。

   She longed for her husband to return home.

   她渴望丈夫早日归来。

adj.

1. of a great distance or duration.
   ▸of a specified distance or duration.
   ▸(of a ball in sport) travelling a great distance, or further than expected.
2. relatively great in extent.
   ▸having a specified extent.
3. Phonetics  (of a vowel) categorized as long with regard to quality and length (e.g. in standard British English the vowel /uː/ in food).
   ▸Prosody  (of a vowel or syllable) having the greater of the two recognized durations.
4. (of odds or a chance) reflecting or representing a low level of probability.
5. Finance  (of shares or other assets) bought in advance, with the expectation of a rise in price.
   ▸(of a security) maturing at a distant date.
6. (of a drink) large, refreshing, and containing little or no alcohol.
7. (long on) informal well supplied with.

n.

1. a long time.
2. a long sound, vowel, or syllable.
3. (longs) Finance  long securities or assets.

adv.

1. for a long time.
   ▸at a distant time:

   long ago.
   ▸throughout a specified period of time:

   all day long.
2. (with reference to the ball in sport) at, to, or over a great distance.

v.