帮帮我翻译下这个run into词组的意思

1。撞到The bus got out of control and ran into a wall。公共汽车失去控制,撞上了墙。2。偶遇I ran into an old girlfriend yesterday。It brought back memories。昨天我无意中遇见旧时女友,唤起一些昔时的记忆。I ran into an old friend in a pub。我在酒吧碰到了一位老朋友。