就像是被擦干净的黑板一样，我们得到的是完全一样的黑板，重新开始在上面写东西。
Like a blackboard that's been completely erased, we now have the very same blackboard, and now we start writing new things on it.
笛卡尔回到黑板前，用一块儿奇怪的布擦干净了黑板然后揉作一团。
Descartes return back to the blackboard, wipes it clean with an odd piece of fur, and then sum up.
笛卡尔回到黑板前，用一块儿奇怪的布擦干净了黑板然后揉作一团。
Descartes return back to the blackboard, wipes it clean with an odd piece of fur, and then sum up.
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