胡佛大坝长期作为内华达州和亚利桑那州主要的交通连接处，虽然卡车已经禁止通行，但是大坝依然面临恐怖袭击的威胁。
Having long been the most accessible river crossing between Nevada and Arizona, the dam is thought to be at risk of a terror strike, with trucks already banned from crossing.
卡车、大吨位的交通工具以及任何载有危险化学物品的车辆都禁止通行。
To begin with lorries, vehicles with large loads and anything carrying dangerous chemicals will be banned.
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