Geohash的好处是能够通过切去散列码末尾的字符来实现任意的精度。
Geohashes have the benefit of arbitrary precision by stripping off characters from the end of the hash.
这样，我可以让它们作为散列的键、将要被检索的字符串列表，等等。
Thus, I can use them as hash keys, lists of strings to be searched, etc.
这是因为尽管从不同的散列中获得同一个字符串的返回值，但是将关键字链接到散列上也只是时间的问题。
This is because although completely different hashes are returned for the same string, it just becomes a matter of time before keys are linked to hashes.
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