We walked one big round, and here we are already nearing back our point of origin, Weissenkirchen.
我们走了一大圈，这里已经离起点外森克尔亨小镇不远了。
And, we are going to shoot a ray from the origin towards this point, and we want to know what portion of the ray is in our solid.
然后从原点引一条射线到这个点上，需要知道射线的那部分在我们的立体中。
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