音长

例句：

1. 1. The singer's voice has a very long melody line.
   这位歌手的声音有着非常长的旋律线。
2. 2. The music has a very long duration.
   这首歌曲的时长很长。
3. 3. The song has a very long tempo.
   这首歌的节奏很慢。