能够在不同工作状态下，快速、慢速行走，只需一个人操作便可在空中连续完成上下、前进、后退、转向等所有动作。
In different working conditions, fast, slow walk, only one person can be in the air continuously complete upper and lower, forward and backward, turning all the action.
这就好像在高速公路上你开快车超过一辆慢速车时的情况，一时间，慢速车可能会向后退成远景一样。
It's like what happens when you in your fast car are passing a slower-moving car on the highway. The slow car can, for a time, appear to move backwards against the distant landscape.
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