type ty = TVar of tvar | TCon of string | TArr of ty * ty | TTuple of ty list
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，这一点在WPS下载最新地址中也有详细论述
Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
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