noun ダウンロード 🔗共有 滑液包 Any of the many small fluid-filled sacs located at the point where a muscle or tendon slides across bone. These sacs serve to reduce friction between the two moving surfaces. Examples : "The runner's inflamed bursa made it painful to lift her arm. " ランナーの炎症を起こした滑液包は、彼女が腕を持ち上げるのを痛くしました。 medicine physiology anatomy body organ AIとチャット語彙ゲーム読解練習