飞行机器人可以把邮件送到人们的家里，且不用处理繁忙的交通。
Flying robots can carry mails to people's houses without having to deal with heavy traffic.
繁忙的交通让主干道超负荷运行。
那个星期四的下午，曼蕾正像往常一样指挥着基地里繁忙的交通。
On Thursday afternoon Ms Munley was doing her usual job of directing traffic on the sprawling base.
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