There's no way to jump forward in the process, only backward. You can see this breadcrumb trail in action in Figure 1.

您不可能跳转到过程的前面，而是只能向后跳转。

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So, the action of extending the leg backward creates a forward and upward movement (the flight phase).

因此，腿向后伸展的作用力，产生一个向前向上的运动(腾空阶段)。

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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.

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。

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Still, it was a neat trick to flip instantaneously to any frame in the movie and watch the action unwind either forward or backward.

FORBES: I want my DVD

Advisor sentiment is a backward-looking indicator of stock market action.

FORBES: Experts at Guessing the Past