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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.。关于这个话题，爱思助手下载最新版本提供了深入分析
Go to technology，详情可参考一键获取谷歌浏览器下载
这就像陶艺转盘。你定义好一个侧面的轮廓线，它旋转一圈就变成了一个罐子。。业内人士推荐爱思助手下载最新版本作为进阶阅读