noun ダウンロード 🔗共有 川床 The path where a river runs, or where a river once ran; the bottom earthen part of a river, not including the riverbanks. Examples : "The children found interesting rocks and pebbles in the riverbed. " 子供たちは川床で面白い岩や小石を見つけました。 geography geology environment nature AIとチャット語彙ゲーム読解練習