Keep the user oriented: Display the previous location and guide users to their next one. Remind users where they've been by programming links to change color after being visited.
保证使用者被引导：显示他们现在所在位置并引导他们到下一位置，访问过的地方要改变连接颜色。
Keep the user oriented: Display the previous location and guide users to their next one. Remind users where they've been by programming links to change color after being visited.
保证使用者被引导：显示他们现在所在位置并引导他们到下一位置，访问过的地方要改变连接颜色。
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