He reached the stairs unnoticed and began descending the cold stone steps, like a ghost.
他走到楼梯口也没被人发现，于是开始像个幽灵样走下冰冷的石头台阶。
As the lieutenant looked up and saw more of the objects descending on them from directly above, he began to scream.
当中尉有所觉察并看到更多的物体从头顶而降的时候，他尖叫了起来。
Fort Hood, Texas: a robotics Rodeo began Tuesday with exhibitors from all over America descending on Fort Hood to show off the latest advancements in robotics technology.
得克萨斯州胡德堡：本周二，在美国胡德堡，一个自主机器人开始向来自美国各地的参展商展示机器人技术的最新进展。
Fort Hood, Texas: a robotics Rodeo began Tuesday with exhibitors from all over America descending on Fort Hood to show off the latest advancements in robotics technology.
得克萨斯州胡德堡：本周二，在美国胡德堡，一个自主机器人开始向来自美国各地的参展商展示机器人技术的最新进展。
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