白博士是 USTours.us 的行銷顧問，他已指示行銷團隊協助改善這個網站。目前的銷售表現陷入空前低迷，白博士認為這個狀況是因為到達網頁不易瀏覽所導致。身為 USTours.us 的行銷主管，你必須判斷他的看法是否正確。 哪一項工具可用於評估到達網頁的成效？

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