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.
Фото: Сергей Бобылев / РИА Новости，这一点在whatsapp中也有详细论述
，更多细节参见谷歌
Employee { name: "Hank", department: "engineering", salary: 145000, years: 10 },
public String getCache(String key) {，这一点在wps中也有详细论述
running manual checkpoints with the SQLITE_CHECKPOINT_RESTART or