retrace\n[ri'treis; ri:-; 'ri:treis]\nvt.\n折回；返回：\nThey retraced their steps to where they started.\n他们顺原路又折回到他们出发的地点。\n沿…重走；[比喻]走回头路，走老路：\nWe should not retrace the route our forefathers had taken.\n我们不应重走我们祖先走过的老路。\n追溯；探查：\nYou may encounter the same question when you retrace the progress of civilization.\n当你追溯文明的进步时，你可能会遇到同样的问题。\n回顾；回忆：\nHe is fond of retracing the experiences of his youth.\n他喜欢回想少年时代的经历。\nn.\n【电子学】(电视的)回扫\n变形：\nvt.\nretraced\n. retracing

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