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Since then , in an attempt to cure a persistent - tendinitis - problem, he has undergone surgery on both knees.
他去做了双膝手术以便治愈自己的伤病.
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Both knees are typically involved, though one usually more extensively than the other.
典型的为侵犯双侧膝关节, 不过一侧较另一侧严重.
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