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Uploaded by ucmedia88 on Feb 19, 2009
如果您走路就像機器人有聲音,尤其是下樓梯,或者是當您蹲下去再站起來時,會發出咯!咯!這樣的聲音,即使沒有什麼特別不舒服,但您還是是關心一下您的膝蓋囉
Science & Technology
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