proper efficient solution

例句：

1. 1. The dress is not proper for the occasion.
   这件连衣裙不适合这个场合。
2. 2.He wore a suit that was too big for him, which was not proper.
   他穿的西装太大，不合适。
3. 3. The teacher gave the student an appropriate punishment.
   老师给那个学生一个适当的惩罚。