九、样条曲线：SPL(spline)创造二次的或立方体齿条（MURBS）曲线
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Most people are inclined to recycle their waste materials as long as the process is not inconvenient or costly, which it is in most MURBs, due to the lack of facilities.
如果方便并且便宜的话，大多数人还是很乐意回收利用他们的废弃物的，但在大多数的集合住宅中都缺少这种设施。
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