因为所有的可见性是预先计算的，您不能实时打开或关闭入口。
Since all visibility is precomputed, you cannot open or close portals at runtime.
实际工作中，常常会发现有的弯曲件经模具弯曲后的实际尺寸与预先计算的展开料尺寸有较大偏差。
In the actual work, it is often discovered that there is a big deviation between actual size of some bending parts after die molding with computing size.
记忆是一种广泛使用的技术，它在Lisp、Python与Perl这样的功能编程语言中使用，给功能赋予预先计算的值。
Memoization is a technique widely used in functional programming languages like Lisp, Python, and Perl for giving functions a memory of previously computed values.
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