求翻译：This afternoon, Sam was walking down the street thinking about something, so he wasn’t paying attention to where he was going. He walked right under a ladder standing against(倚着) a building. A black cat ran out of a door just at that moment, and Sam fell over it. His head hit the ladder. A man washing the window was at是什么意思？

待解决 悬赏分：1 - 离问题结束还有