对去年秋天迅速向前移动。
腾空阶段：当运动员在空中移动之时，他的腿先向后摆动，然后迅速向前移动。
The flight phase: As an athlete moves through the air, his leg swings backward and then moves rapidly forward.
腾空阶段：当运动员在空中移动之时，他的腿先向后摆动，然后迅速向前移动。
The flight phase: As an athlete moves through the air, his leg swings backward and then moves rapidly forward.
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