在孩子们上学的这条路上，拉土、拉石子、运水泥、拖运钢筋的车辆来来往往，人车混行，很不安全。
O B-Person I-Person I-Person O O O B-Location I-Location I-Location I-Location O B-Thing I-Thing O O B-Thing I-Thing O O B-Thing I-Thing O O O B-Thing I-Thing O B-Thing I-Thing O O O O O B-Person B-Thing O O O O O O O O