The most 10 plausible theory is that they have developed a secret method of locomotion which they are able to conceal from human eyes.
最可信的说法似乎是，它们练就了一种人类肉眼看不见的秘密的移动本领。
On the guide of holistic locomotion design, the paper proposed a set of method in locomotion element and locomotion attribute design.
在整体运动设计思路的指引下，提出了针对运动的元素及运动属性的设计思路。
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