昨天，在我走近公共图书馆前门时，一位满头白发的绅士后退几步，给我扶门。
Yesterday, as I was coming near the front door of our public library, a white-haired gentleman stepped back to hold the door for me.
一种明智的做法是后退几步。
如果我们后退几步，从头开始考虑，有一个计算硬件。
If we take a few steps back and consider the beginning, there was computing hardware.
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