1. out of bounds
   超出界外,犯规,越轨;禁止入内
   

1. England is bounded on the north by Scotland.
   英格兰北部与苏格兰接壤。
2. I felt bound to mention it.
   我觉得非提到这一点不行。
3. Melancholy bounds on madness.
   忧郁近乎疯狂。
4. It's bound to create trouble sooner or later.
   这迟早会引起麻烦。
5. He bounded up the wide steps with vigor.
   他精神十足地跃上一级宽阔的台阶。

　1个名词解释