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Lack of muscle and propelling power.
缺乏肌肉和推动力。
youdao
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The principal propelling power is furnished by the back legs which travel straight forward.
当向前直线行走时，后腿是主要的推动力量。
youdao
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The principal propelling power is furnished by the back legs which travel straight forward.
当向前直线行走时，后腿是主要的推动力量。
youdao