Recommendation：How much you really know about “上 (up)” and “下 (down)” when you learn Chinese?
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您好，我在 [对外汉语学习网] 发现了一个很好的学习资料： 相信一定对你有帮助，去看看吧！ 文档的名称是：How much you really know about “上 (up)” and “下 (down)” when you learn Chinese? 网址是：http://tcfl.tingroom.com/basic/vocabulary/5084.html
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