1. The students swarmed towards the playground.
   学生们一窝蜂似地奔向操场。
2. They quickly lined up in the playground.
   他们很快在操场上排好了队。
3. A group of children are playing games on the playground.
   一群孩子正在操场上做游戏。
4. He was bashed up in the playground by some older boys.
   有几个年龄较大的男孩子在操场上对他动武.
5. The children played in the playground half naked.
   这些孩子半裸着身体在操场上玩耍。

　2个名词解释