“乱放”的英语可以翻译为：leave about，leave about(around) ...

屋里到处乱放着衣服.The clothes were scattered round the room any old how.他总喜欢把东西到处乱放.He is apt to leave things about.这个房间布置得太好了，让人不好意思乱放东西。This room is so impressive it would be a shame to clutter it up....