窗口

例句：

1. 1.The window is dirty and needs cleaning.
   窗户脏了，需要清洁。
2. 2. She opened the window to let fresh air in.
   她打开了窗户，让新鲜空气进来。
3. 3. The window was covered with frost this morning.
   今天早上窗户上覆盖着霜。