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.
一个天文单位是地球到太阳之间的距离，大约9300万英里。
One AU is the distance between the Earth and the sun, about 93 million miles.
一个天文单位是地球与太阳的距离，大约9300万英里(1.5亿公里)。
One astronomical unit is the distance between the Earth and the sun, about 93 million miles (150 million km).
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