Seeing from the opening windows, I saw my classmates sitting on their seats regularly, the teacher walked in the classroom with a book in his hand and the iron ruler under his arm.

• 从开着的窗子望进去，我看到同学们已端坐在自己的座位上，老师手里拿着一本书，胳膊下夹着铁戒尺，在教室里走过来走过去。