两名牵着警犬的警察在离他距离很近的后方。
我们从小区后门出去，来到附近的一个小村庄。虽然距离很近，但环境就像是两个世界一样。
I thought she bought our produce near her house but she sent me the other way, just out the back door of our compound to a little village just around the bend, but a world away.
也就是能够分开两个距离很近的两颗星的能力，单位是角秒1(seconds of arc)。
It is the ability to separate two closely-spaced stars into two distinct images measured in seconds of arc.
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