Make sure you have read why and how to practice swimming drills before you start to work on this technique.

确保你已经阅读为什么和怎样练习游泳训练开始前的工作在这个技术。

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Make sure you have read why and how to practice swimming drills before you start to work on this technique.

确保你已经阅读为什么和怎样练习游泳训练开始前的工作在这个技术。

youdao