1. twelve-tone system
   n. 十二音制
   

1. I was a twelve-year-old schoolgirl.
   我当时是一个十二岁的女学生。
2. It wants three minutes to twelve.
   现在是11:57。
3. There are twelve chickens in this hatch.
   这一窝有十二只小鸡。
4. A criminal might receive twelve strokes of the birch.
   罪犯可能要挨十二鞭。
5. The average age of the boys in this class is twelve.
   这个班学生的平均年龄为十二岁。

　1个名词解释

　1个形容词解释