自动加引点：一些排字机所具备的功能。只要一个命令就可以把左右文字间的空位用引点填满。
Auto leaders: Functions of typesetting available on some systems that with a command, leaders will automatically fill up a space.
将我们的类推再引深一点，试想水溢位在有许多暴露在外的电线的工作台上。
To stretch our analogy a bit, imagine that the water is spilling on a worktable with lots of exposed electrical wiring.
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。
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.
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