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。
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。
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