单词：separated convex set
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backset, n 挫折，倒退；涡流，逆流＝check 【记】backset＝set back－倒退 【反】hike（n 远足，增加）
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After World War II, many Korean families who were North or South of the line that divided the two countries were separated. The Korean War more than 60 years ago made meeting nearly impossible. And now some separated families in South Korea say they
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