美国人是否有能力和远见消除这些剥夺数百万同胞民主权利和机会的结构性障碍？
Do Americans have the capacity and vision to remove these structural barriers that deny democratic rights and opportunities to millions of their fellow citizens?
有一些结构上的障碍使得这些事情更加难实现。
There are structural obstacles that make these things harder to do.
双足机器人有良好的地面适应能力，它可以通过改变腿部结构来达到跨越不同的障碍物的，具有广阔的应用前景。
The biped robot has better adaptability to ground, it has wide application prospect, it may reach over various obstacles by changing the structure of the legs.
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