dual是什么意思

dual

英 ['dju??l] 美 ['d??l]

dual 雙重的

來自拉丁語duo, 二，詞源同two.

dual: dual: [17] Dual was borrowed from Latin duālis, a derivative of duo ‘two’ (which is a distant relative of English two). In Latin it was used particularly by grammarians, to denote the category ‘two people or things’ (as opposed to the plural, referring to three or more), and this was the earliest sense of the word adopted by English. (Incidentally, despite its formal similarity, and a common meaning element – two people participate – duel [15] is not etymologically related to dual; it comes from medieval Latin duellum, which was originally an archaic form of Latin bellum ‘war’.
=> two
dual (adj.): c. 1600, from Latin dualis, from duo "two" (see two). Related: Dually.

4. The reason for the discount is the use of dual - class shares.: 存在折價(jià)率問題的原因是雙重投票權(quán)股票(dual -classshares )的使用.

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(bào)警系統(tǒng).