[數(shù)] 環(huán)單位元(素) unit element: 單位碼元; 單位元; 單元碼元ring unit: 環(huán)形件ring type element: 環(huán)形元件ring-type element: 環(huán)形元件assembly and welding of unit element: 單元件組焊下載手機詞典可隨時隨地查詞查翻譯