This lets usfilter the data frame as a whole, selecting rows of possible interest.
这就让我们可以将数据帧作为一个整体进行过滤，挑选出可能引起注意的连续点。
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So far the site is mostly a hang-out for Silicon Valley insiders (it's in closed beta) but as more and more of the rest of usfilter in - hopefully the excellent user-experience can scale.