一切都很完美，但机器人肯定还是有一些物理限制的，比如Spykee就不可以上下楼梯。
While everything worked correctly, there were definite physical limits. The Spykee cannot go up or down stairs.
机器人底部安装的一个“防掉落”感应器可以防止机器人从楼梯上摔下来。
A "drop off" sensor underneath the robot prevents it from falling down stairs.
这些机器人被要求驾驶车辆、攀爬楼梯以及从事机械工作。这类活动让人类来做很简单，但是对机器人来说要难得多。
The robots were required to drive a vehicle, climb up steps and do mechanical work. Such activities are easy for humans to perform, but more difficult for machines.
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