六安有一条老沛河绕城而过，过去恰似“龙须沟”，行人靠浮桥过渡，到干旱季节，河水污浊，杂草丛生。
B-Location I-Location O B-Metric I-Metric B-Thing I-Thing I-Thing O B-Location O O O O O O O O B-Thing I-Thing I-Thing O O B-Person I-Person O O B-Thing O O O O B-Time I-Time I-Time I-Time O B-Thing I-Thing O O O B-Thing I-Thing O O O