running 前面加介词，介词后面跟名词，动词，动名词，例如：
1、He has demonstrated a strong preference for being shod in running shoes.他给人的感觉是特别偏爱穿跑步鞋。
2、Some of the people on the sports ground are playing ball games， and some are running.操场上也有打球的，也有跑步的。
3、By that time the new system should be up and running.到那时这个新系统应该会运转起来了。
