And we've been building better metal detectors, armored Humvees and pilotless drones.
而我们建造了更先进的金属探测器 、 装甲车和无人驾驶坦克.
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Maryland state troopers were patrolling in Humvees, and the governor asked citizens to stay home.
马里兰州的州警使用悍马吉普车巡逻, 州长也要求市民们不要出门.
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