And that will change collective behavior.

这也将改变集体行为。

Then they mapped the flight of each midge, and did a mathematical analysis of the collective behavior.

然后他们绘制了每一个蚊子的飞行路线。接着对蚊子的集体行为作了数学分析。

So after a while, metadata doesn't even matter anymore because YouTube can use collective user behavior in order to sort a video.

所以过了一段时间，元数据甚至不再重要，因为YouTube可以使用集体用户行为来对视频进行排序。