self.conn.commit()
We wanted a scenario where, say, 5 well-placed border points could efficiently represent an area with 5,000 internal points and 10,000 road edges. This would reduce those 10,000 edges to just 5*4/2 = 10 shortcuts for routing through that cluster at a high level – an incredible 1:1000 point ratio and a 30x reduction in edges to consider for the high-level path!，更多细节参见im钱包官方下载
，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
Design principles。关于这个话题，快连下载安装提供了深入分析
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换句话说，中国游艇产业过去之所以规模有限，并不是因为制造能力不足，而是因为需求土壤尚未形成。