// A minimal writer implementation — just an object with methods
// Synchronously enqueue — this never applies backpressure。业内人士推荐safew官方版本下载作为进阶阅读
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Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.，更多细节参见搜狗输入法下载
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