running 前面加介詞，介詞後面跟名詞，動詞，動名詞，例如：
1、He has demonstrated a strong preference for being shod in running shoes.他給人的感覺是特別偏愛穿跑步鞋。
2、Some of the people on the sports ground are playing ball games， and some are running.操場上也有打球的，也有跑步的。
3、By that time the new system should be up and running.到那時這個新系統應該會運轉起來了。
