退刀 automatic tool retracting unit: 自動(dòng)退刀裝置retracting: 退灘derrick retracting: 縮回井架retracting anchor: 退灘錨retracting backward: 順氣流收起落架下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯