The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
左栏的文本框排列顺序是乱的。请把它们拖到右栏，恢复成原文的正确顺序。
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1For example, a mechanical ankle brace can improve the metabolic efficiency of human walking, implying that walking is inefficient.
2Similarly, legged robots struggle to deploy different gaits, just as roboticists struggle to enumerate them.
3Long-held assumptions, such as the need for energy efficiency, have already been overturned.
4But variation of movement is important, too: such an ankle brace holds you back if you try to skip, gallop or skitter.
5Researchers need to understand why different forms of locomotion evolved.
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