如果为这个函数传递一个用户ID，它将在一个多维数组中按日期倒序的顺序返回那个用户发出的贴子。

If you pass this particular function a user id, it returns all the posts made by that user in reverse-chronological order, all bundled in a nice, multidimensional array.

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定序尺度(rank)—定序尺度可应用于一组有顺序的数据，有顺序指的是属于该尺度的值和观察值可以按顺序排列或附带有评级尺度。

Rank - a rank scale applies to a set of data that is ordinal (the values and observations belonging to it can be put in order or have a rating scale attached).

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它将按顺序添加整数，因此在结束时已经给列表排好序。

It adds the integers in order, so the list is already sorted at the end.

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