诸如购买、定向广告、约会、找活动等等问题，都可以作为推荐问题
Many problems including shopping, targeted advertising, dating, finding events, etc. can be framed as recommendation problems
再也不需要活动记录(activation record)，所以我们将删掉它，并将尾部调用的函数重定向返回到调用我们的函数。
The activation record isn't needed anymore, so we are going to cut it out and redirect the tail-called function back to the function that called us.
在这个例子中，交换机2的进入流量将被重定向到交换机1中活动的服务模块，作为交换机1的进入流量也将被送到这个活动模块。
In this example, switch 2 ingress traffic will be redirected to the active service module in switch 1, as switch 1 ingress traffic will be sent to that active service module too.
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