美[?du:?l] 1 . his dual role as composer and conductor
他兼任作曲家和指揮的雙重角色
來自《權威詞典》
2 . He has dual role as composer and conductor.
他兼作曲家及指揮的雙重身分.
來自《簡明英漢詞典》
3 . The airplane had dual controls.
這架飛機有兩套操縱裝置.
來自《現代漢英綜合大詞典》
4 . The reason for the discount is the use of dual - class shares.
存在折價率問題的原因是雙重投票權股票(dual-classshares )的使用.
來自互聯網
5 . A safety alert system by DTMF ( Dual - tone multifrequency ) mode is introduced.
介紹一種采用DTMF ( Dual-ToneMultifreqency ) 信號方式通信的安全報警系統.
來自互聯網
1.consisting of or involving two parts or components usually in pairs;
an egg with a double yolk
2.having more than one decidedly dissimilar aspects or qualities;
a double (or dual) role for an actor
3.a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural);
ancient Greek had the dual form but it has merged with the plural form in modern Greek
DUAL：Diffusing Update Algorithm ,彌散更新算法。EIGRP組件之一。dual是Oracle與數據字典一起自動創建的一個虛擬表﹐它只有一列﹕DUMMY﹐其數據類型為﹕VARCHAR2(1)。dual中只有一行數據﹕ 'X '。dual屬于sys模式﹐但所有用戶都可以使用dual名稱訪問它﹐用SELECT計算常量表達式﹑偽列等值時常用該表﹐因為它只返回一行數據﹐而使用其它表時可能返回多個數據行。用來查那些不屬于實際表里的內容，有時也用來檢查某表某條件的記錄
