dual

dual
adjective

[attrib.]consisting of two parts, elements, or aspects
双的，两的；两体的；二元的
their dual role at work and home.
他们在家庭和工作中的双重角色。
■(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）
■(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。
(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)（定理或表达式等）对偶的

noun

(dualled, dualling)

[with obj.](Brit.)convert (a road) into a dual carriageway
(英)改（道路）为分隔式车行道
dualling the A1.
将A1号干线改为分隔式车道。

派生
dualize
verb

dually
adverb
语源

late Middle English (as a noun denoting either of the two middle incisor teeth in each jaw): from Latin dualis, from duo 'two'

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