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.
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。
For great power always belonged to thee alone: and who shall resist the strength of thy arm?
你随时可用你的大能,有谁能抵抗你有力的手臂?
She's balancing herself on the strength of a single arm.
她仅用一只手臂的力量保持着整个身体的平衡。
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