You have the same arm length from the friends in front and back of you.
你与来自前后的朋友们都有相同的手臂长度距离。
This is another friend arm length, two arms lengths.
这是另一个朋友的手臂长度，两只手臂的长度。
Upper arm: Of medium length, proportionate to the whole.
上臂：中等长度，相称的整体。
Upper arm is about equal in length to the shoulder blade in order to allow for good extension.
上臂长度约等于肩胛骨，以便为良好的扩展性。
Start with a length of each stroke with one arm held down to your side.
开始每个有距离的泳姿只用一只胳膊。
Short legs, arm length, head forward.
腿短臂长，头部前倾。
Short legs, arm length, head forward.
腿短臂长，头部前倾。
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