As you master the drill, you main focus is to have you head move within the body wave, move it forward as you breathe, and let it lead your body into the water without pause.
当你掌握了这个练习以后，你的焦点应该集中在你的头的移动是否在身体波浪中，呼吸时向前，让头引领你的身体没有停顿的进入水中。
The selection and master design of guide drill tool are important problems usually met by field drilling operator and manufacturer.
导向钻具的选型与总体设计，是现场钻井工作者与制造厂家经常碰到的重要问题。
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