对胶原结构的医学分级，长期以来见解不一。
There are different opinions on in medicine structural grading of collagen for a long time.
对胶原结构的医学分级，长期以来见解不一。
There are different opinions on in-medicine structural grading of collagen for a long time.
对胶原结构的医学分级，长期以来见解不一。
There are different opinions on in-medicine structural grading of collagen for a long time.
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