The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
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