单词：concave-convex function
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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到 听力原文收集区 ，您将会获得 10 到 30 积分的奖励 ! Thank you ！
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[00:12]Day 3 [00:15.26]feature [00:16.66]Even a skilled writer [00:18.16]could not describe all the features [00:20.06]that make one face different from another. [00:24.71]function [00:26.29]What is his function on the committee? [00:30.7
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