为了了解肩膀，看一下人体骨架。

To understand the shoulder, look at a human skeleton.

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骨骼肌把骨架的各种骨头组合在一起，使人体有了一个形状。

Skeletal muscles help hold the bones of the skeleton together and give the body shape.

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骨骼肌把骨架的各种骨头组合在一起，使人体有了一个形状。

Skeletal muscles help hold the bones of the skeleton together and give the body shape.

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