It's totally legit to cull a function, get back a value, do nothing with it other than compare it to another value.
挑选一个函数是完全合法的，返回一个值，用它来做些事情而不是用它与其它的值比较。
Cull out, that is, remove back faces; assume counterclockwise winding order for primitives.
剔除模式，剔除背面；假设图元顶点按逆时针顺序旋转排列。
They are then taken back to the slaughterhouse, where workers cull them and excise their livers.
然后它们会被送回屠宰场，那里的工人会进行精选，并切除它们的肝脏。
They are then taken back to the slaughterhouse, where workers cull them and excise their livers.
然后它们会被送回屠宰场，那里的工人会进行精选，并切除它们的肝脏。
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