The search results pull up a field for you to enter a tracking number, rather than making you click through to UPS.com to do that.

搜索结果页面会提供地方让你直接输入订单号查询，而不是要你点击UPS.com查询。

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Note: you must have enabled click through tracking in the campaign in order for this to be recorded.

注意：为了能够记录到点击量，你必须在活动中启用点击跟踪。

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To be sure, cookie technology does not prove perfect causality, but it provides a lot more transparency than simply tracking "click-through rates"--or running a print ad in a newspaper or magazine.

FORBES: Magazine Article