* @param {number} target 目的地位置（英里）
7-day free trial, then $59.99/month for 2 months，这一点在旺商聊官方下载中也有详细论述
Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.，这一点在51吃瓜中也有详细论述
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