And I don't know why, but since time immemorial that is the way computer scientists have drawn trees.

叶子是在最下面的，我不知道为什么,但从记事以来他们就是这么画树的,这也许就是为什么我们。

麻省理工公开课 - 计算机科学及编程导论课程节选

No. Everybody's been using that, sort of since time immemorial or at least since the sixteenth century.

不，每个人都在用它，这个进程可能可以追溯到太古时期，不过至少16世纪。

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