留下历史的足迹 Sichuan Building Science
留下播火者的足迹 Science Technology and Publication
都很少留下旅人的足迹 Had worn them really about the same
我们在树林中行走时，我们留下足迹。
历史是人的足迹。但并不是所有留下足迹的人都敢于正视自己的历史。
History is the footprint. But not all footprint dared to face up to their own history.
此外，缓存不会被清除，用户过去的所有所到之处，都会在缓存中留下足迹。
In addition, the cache is not cleaned and thus continuously builds up an imprint of the areas in which you have been both recently and in the past.
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