noun ダウンロード 🔗共有 歯車 A wheel with a toothed rim, intended to engage with others, or similar equipment, to form a gear Examples : "The old clock stopped because one of the brass gearwheels had broken its teeth. " 古い時計は、真鍮製の歯車の歯が欠けて止まってしまった。 machine technical part device technology system AIとチャット語彙ゲーム読解練習