Although the cause is unknown, it is known that the body produces too much of a protein called collagen.

 
  • 雖然硬皮病的起因尚未確定,但有一點(diǎn)是已知的,即體內過(guò)多產(chǎn)生一種叫膠原蛋白的蛋白質(zhì)。
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