... 中速游：moderate effort swimming 慢速长游：long easy swimming 变速游练习：alternating slow-fast set ...
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long distances at slow pace
... long course river championship 长距离江河游泳锦标赛 long distances at slow pace 慢速长游 long distance at moderate speed 中速长游 ...
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短语
慢速长游泳
long easy swimming
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