踏板上下移动，同时也交替着弯曲伸直着脚踝，迫使肌肉纤维交替着伸长缩短。

The footplate moved up and down so it alternately bent and straightened the ankle, forcing the fibres within the muscles to alternately lengthen and shorten.

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实际情况不会总是那么理想，但你要注意尽量缩短手臂弯曲攀爬的时间。

You'll often have to compromise on these ideals, but be aware and minimize time spent in half-cocked arm positions.

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在这种情况下，缩短的流星对框架的中心，在弯曲的肢体的地球和一层绿色的气辉。

In this case, the foreshortened meteor flash is right of frame center, below the curving limb of the Earth and a layer of greenish airglow.

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