n.

1. （距离、尺寸的）长度[U][C]
   The fish is two feet in length.

   这条鱼有两英尺长。

2. （时间的）长短，期间[U][C]
   The length of the movie is two hours.

   影片长两小时。

3. 全长；全程[the S][（+of）]
   We walked the length of the street.

   我们从街这头走到那头。

4. （作为长度单位的）物体的长度，动物的体长[C]
   The horse won the race by two-and-a-half lengths.

   这匹马以两个半马身赢得了比赛。

5. （一）段，（一）节[C][（+of）]
   We need a length of pipe.

   我们需要一节管子。

n.

1. the measurement or extent of something from end to end; the greater or greatest of two or more dimensions of an object.
   ▸the length of a horse, boat, etc., as a measure of the lead in a race.
2. the amount of time occupied by something.
3. the quality of being long.
   ▸Prosody  & Phonetics  the metrical quantity or duration of a vowel or syllable.
4. the full distance that a thing extends for:
   the muscles running the length of my spine.
   ▸the extent of a garment in a vertical direction when worn.
5. a stretch or piece of something.
6. an extreme to which a course of action is taken.
7. (in bridge or whist) the number of cards of a suit held in one's hand.
8. Cricket  the distance from the batsman at which a well-bowled ball pitches.