It is iron ruler, I have one with date: Spring, 15th year, Yongzheng reign, Qing.
正是铁尺，我有一枝类似的铭雍正十年春月。
The master was walking up and down the room with the iron ruler under his arm and a book in his hand.
老师在教室里踱来踱去，胳膊下夹着铁戒尺，手里拿着书。
Through the open window I saw my schoolmates already in their places. The master was walking up and down the room with the iron ruler under his arm and a book in his hand.
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。
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