Under a federal mandate known as E911, they had to upgrade their networks to ensure that anyone dialling the 911 emergency number could be located to within 100 metres.
遵照一条叫做E911的联邦法令，他们要升级服务网络，确保能找出任何拨打911呼救电话的人所处的位置，误差不超过100米。
Under a federal mandate known as E911, they had to upgrade their networks to ensure that anyone dialling the 911 emergency number could be located to within 100 metres.
遵照一条叫做E911的联邦法令，他们要升级服务网络，确保能找出任何拨打911呼救电话的人所处的位置，误差不超过100米。
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