syd12412.11大A班宋雨宸《水平面比高矮》
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Published on 11 Dec 2019 / In
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12.11大A班宋雨宸《水平面比高矮》
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宝贝很不错哟，能直观的感知到高矮的相对性。我们比较高矮就是要在同一水平线上比较哟。^_^