1
- attrib. consisting of two parts, elements, or aspects双的, 两的; 两体的; 二元的; 双重的, 两重的：
their dual role at work and home.
他们在家庭和工作中的双重角色。
1.1
- Grammar (in some languages) denoting an inflection that refers to exactly two people or things (as distinct from singular and plural)【语法】双数的（一些语言的一种屈折变化, 与单复数变化不同）。
1.2
- (in an aircraft) using dual controls（飞机）双重控制的, 复式操纵的：
a dual flight.
复式操纵飞行。
2
- （常作 dual to）Mathematics (of a theorem, expression, etc.) related to another by the interchange of particular pairs of terms, such as 'point' and 'line'.【数】（定理、表达式等）对偶的。
1
- Grammar a dual form of a word【语法】双数词。
1.1
- mass noun the dual number双数。
2
- Mathematics a theorem, expression, etc., that is dual to another【数】对偶定理（或表达式等）。
(dualled, dualling)with obj.
- Brit. convert (a road) into a dual carriageway〈英〉把（道路）改为复式车行道：
dualling the A1.
将A1公路改为复式车行道。
派生词
dualize
（亦作 -ise）verbdually
adverb词源
late Middle English (as a noun denoting either of the two middle incisor teeth in each jaw)： from Latin dualis, from duo 'two'.