bursa
bursa[ˈbəːsə](pl. bursae -siː或 bursas)- (Anatomy)a fluid-filled sac or sac-like cavity, especially one countering friction at a joint
(剖)囊,黏液囊
派生bursaladjective语源- early 19th cent.: from medieval Latin, bag, purse', from Greek bursa 'leather'
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