一英里的距离。
以后，每二星期左右增加四分之一或二分之一英里的距离。
After that, increase your distance a quarter or half mile every two weeks or so.
他们显然在谈笑，由于隔得那么远——大约一英里的距离，他们谈些什么，我当然一句也听不清楚。
Apparently they were talking and laughing, though at that distance — upwards of a mile — I could, of course, hear no word of what was said.
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