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With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
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Why am I writing this today?
premium version with more advanced features such as plagiarism detection
不久前又收到桂红的短信。桂红说，您好好休养，待到春暖花开，您约褚老师一起来我们湖北宜城宋玉中学吧，看看打工子弟的孩子们，给他们捐点书、讲讲课，好吗？