dual

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++du·al /ˈdjuːəl $ ˈduːəl/ ●○○ adjective [only before noun]  TWOhaving two of something or two parts 双的，双重的，两部分的 → singledual role/purpose/function The bridge has a dual role, carrying both road and rail. 这座桥有双重用途，既作公路又作铁路。 a dual system of education 二元[双元]教育体系dual citizenship/nationality She has dual nationality, of Canada and Britain (=she is a citizen of Canada and Britain). 她有加拿大和英国双重国籍。 —duality /djuˈæləti $ du-/ noun [uncountable]

Examples from the Corpus

dual• The dual character of therapy, then, is actually two sections of the same thing: relieving engrams.• It must also be reinforced by matrix systems such as dual control and evaluation systems..• It's much safer if you learn to drive in a car which has dual controls.• The magistrate's court has a dual function: to try minor cases and consider whether in more serious cases there is enough evidence for a trial to take place.• I can summarize the preceding by pointing to the fact that there is actually a dual metaphor being employed.• He has dual nationality because his father was born in Pakistan and his mother is British.• This is not the place to explore the subtleties of dual or segmented labour market theories.• He found it difficult to cope with the dual pressures of work and home life.• Don Jose continued in his dual role of father and teacher to his son.dual citizenship/nationality• Some of the athletes in this international potpourri, like Kaila, McGuirk and Thomson, hold dual citizenship.• There could not even be a question of dual nationality.• Why, Fox is so diverse that he even has dual citizenship -- neither of them in the United States.• Mr Kohl himself has floated the idea of offering dual citizenship on a trial basis.• However, dual citizenship would not be allowed.Origin dual (1600-1700) Latin dualis, from duo “two”

du·al adjectiveChineseSyllable  

two something having or of two parts Corpus

dual
du‧al /ˈdjuːəl $ ˈduːəl/ adjective [only before noun]having two of something or two parts ⇨ single
    dual role/purpose/function
    The bridge has a dual role, carrying both road and rail.
    a dual system of education
    dual citizenship/nationality
    She has dual nationality, of Canada and Britain (=she is a citizen of Canada and Britain).
—duality /djuˈæləti, djuˈælɪti $ du-/ noun [uncountable]

dualBrE /ˈdjuːəl/ 🔊NAmE /ˈduːəl/ 🔊 adjective [only before noun] having two parts or aspects 两部分的；双重的；双的◆his dual role as composer and conductor他兼任作曲家和指挥的双重角色◆She has dual nationality (= is a citizen of two different countries). 她具有双重国籍。🔊🔊◆The piece of furniture serves a dual purpose as a cupboard and as a table. 这件家具有两个用途，既作橱柜也作饭桌。🔊🔊wash ◇ rinse ◇ cleanse ◇ dry-clean

These words all mean to remove dirt from sth, especially by using water and/or soap. 以上各词均含打扫、洗净之义，尤指用水、肥皂等。

• clean to remove dirt or dust from sth, especially by using water or chemicals 指除去灰尘、打扫，尤指用水或化学品洗净、擦净：◆The villa is cleaned twice a week. 这栋别墅一周打扫两次。◆Have you cleaned your teeth? 你刷牙了吗？◆This coat is filthy. I'll have it cleaned(= dry-cleaned). 这件大衣脏了，我得送去干洗。
• wash to remove dirt from sth using water and usually soap 指洗、洗涤：◆He quickly washed his hands and face. 他很快把手和脸洗了。◆These jeans need washing. 这条牛仔裤该洗了。
• rinse to remove dirt, etc. from sth using clean water only, not soap; to remove the soap from sth with clean water after washing it 指用清水冲洗、清洗、冲掉皂液：◆Make sure you rinse all the soap out. 一定要把皂液冲洗干净。
• cleanse to clean your skin or a wound 指清洁（皮肤）、清洗（伤口）
• dry-clean to clean clothes using chemicals instead of water 指干洗

Patterns

• to clean/wash/rinse/cleanse sth in/with sth
• to clean/wash/rinse sth from sth
• to clean/wash/cleanse a wound
• to clean/wash the car/floor
• to wash/rinse your hair
• to have sth cleaned/washed/dry-cleaned

wash ◇ rinse ◇ cleanse ◇ dry-clean

These words all mean to remove dirt from sth, especially by using water and/or soap. 以上各词均含打扫、洗净之义，尤指用水、肥皂等。

• clean to remove dirt or dust from sth, especially by using water or chemicals 指除去灰尘、打扫，尤指用水或化学品洗净、擦净：◆The villa is cleaned twice a week. 这栋别墅一周打扫两次。◆Have you cleaned your teeth? 你刷牙了吗？◆This coat is filthy. I'll have it cleaned(= dry-cleaned). 这件大衣脏了，我得送去干洗。
• wash to remove dirt from sth using water and usually soap 指洗、洗涤：◆He quickly washed his hands and face. 他很快把手和脸洗了。◆These jeans need washing. 这条牛仔裤该洗了。
• rinse to remove dirt, etc. from sth using clean water only, not soap; to remove the soap from sth with clean water after washing it 指用清水冲洗、清洗、冲掉皂液：◆Make sure you rinse all the soap out. 一定要把皂液冲洗干净。
• cleanse to clean your skin or a wound 指清洁（皮肤）、清洗（伤口）
• dry-clean to clean clothes using chemicals instead of water 指干洗

Patterns

• to clean/wash/rinse/cleanse sth in/with sth
• to clean/wash/rinse sth from sth
• to clean/wash/cleanse a wound
• to clean/wash the car/floor
• to wash/rinse your hair
• to have sth cleaned/washed/dry-cleaned

 ➡  see also dual-purpose