在相同划水频率下要减少SPL，是要求最严格的技术之一。
Reducing SPL at the same Tempo is one of the most exacting of all skills.
有不少为公开水域准备的事情你可以在泳池里做，如双侧呼吸，抬头和划水频率训练。
There are a few things that you can do in the pool to prepare for swimming in open water; bilateral breathing, head lifting and stroke rate training.
就像在第一点提到的，这要根据你的划水频率和在水里移动手臂的能力决定，牵涉到力量和耐力。 因为水的密度比空气大很多，不断地划水需要你手臂肌肉很好的耐力。
So in order to move your hand through water which is a much heavier medium than air, it will require more strength - to do that over time requires endurance of your arm muscles.
伊恩：“在3-3-3练习中，艾迪提到了划水的频率会放慢，这样你就可以集中思考如何在细微之处作出改进。”
Ian: "on the 3-3-3 drill, Eddie talks about the fact that slows down the stroke that you can focus on getting the little things right."
水舱固有频率是刻划水舱特征的基本参数。
The natural frequency is one of the parameters characterizing the feature of the anti rolling tank.
水舱固有频率是刻划水舱特征的基本参数。
The natural frequency is one of the parameters characterizing the feature of the anti rolling tank.
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