origin of muscle 肌起端
Because these joints are not covered by muscle, pain here is rarely of muscular origin.
因为这些关节不是由肌肉包裹的，所以这些疼痛源于肌肉的可能性极小。
Biceps: a muscle with two heads or points of origin.
二头肌：起端有两个头或端的肌肉。
A tear at the origin of the deltoid muscle is uncommon and usually occurs as a complication of shoulder surgery.
撕裂的起源三角肌是罕见，通常发生的肩部手术后的并发症。
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