In addition it is motor-driven than the stroke length adjustment of costs to many low.

另外它比电机驱动的冲程长度调节成本要低的多。

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Start with a length of each stroke with one arm held down to your side.

开始每个有距离的泳姿只用一只胳膊。

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Start with a length of each stroke with one arm held down to your side.

开始每个有距离的泳姿只用一只胳膊。

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