dual
dual — 形容詞
1. having or consisting of two separate parts, functions, or aspects that work toge
雙重的
由兩部分組成或具兩種功能的
having or consisting of two separate parts, functions, or aspects that work together as one — for example, a kitchen tool that both chops and grinds, or a manager who also handles customer service.
Chiara bought a sofa with a dual function — it folds out into a bed.
Chiara 買了一張兼具雙重功能的沙發——可以展開成床。
dual function / dual purpose
The new phone has a dual camera that takes wide and close-up shots.
這款新手機配備雙鏡頭，可拍攝廣角與近距離照片。
Naoko's dual role as editor and translator keeps her schedule very full.
Naoko 同時擔任編輯與翻譯的雙重角色，行程非常滿。
The gym offers a dual membership that covers both the pool and the fitness centre.
這家健身房提供同時涵蓋游泳池與健身中心的雙重會員資格。
- single
having only one part or function
文法句型
dual + noun
用法筆記
Only used before a noun. Cannot follow linking verbs (e.g. not 'the role is dual').
常見錯誤
2. referring to a car or van that has two identical sets of driving controls — the
雙控的
車輛配有兩套駕駛操控裝置的
referring to a car or van that has two identical sets of driving controls — the learner operates the main set while the instructor can use the second set to intervene when necessary.
Driving school cars have dual controls so the instructor can brake from the passenger side.
駕訓班的車配有雙操控裝置，教練可以從乘客座踩煞車。
dual controls in a learner vehicle
Quan passed his test quickly because he practised in a car with dual controls.
Quan 因為在配有雙控裝置的車上練習，很快就考到了駕照。
Most driving instructors insist on dual-control cars for safety during lessons.
大多數駕訓教練堅持使用雙控車輛，以確保上課時的安全。
Sivan felt much safer during her first lesson knowing the car had dual pedals.
Sivan 知道車子有雙踏板後，第一次上課就安心多了。
文法句型
dual-control + noun
dual + controls/pedals/brakes
用法筆記
Almost always appears before 'controls', 'pedals', or 'brakes'. The compound form 'dual-control' (with a hyphen) is common before other nouns like 'car' or 'vehicle'.
3. having the legal right to be recognised as a citizen of two nations simultaneous
雙籍的
同時擁有兩國國籍身分的
having the legal right to be recognised as a citizen of two nations simultaneously, carrying the privileges and duties of each.
Bilal holds dual citizenship in Canada and Lebanon through his parents.
Bilal 透過父母取得加拿大與黎巴嫩的雙重國籍。
dual citizenship / dual nationality
Some countries, such as Japan, do not let citizens hold dual nationality after age twenty.
有些國家（如日本）不允許公民在年滿二十歲後擁有雙重國籍。
Lucía applied for dual British and Spanish citizenship after five years in London.
Lucía 在倫敦居住五年後，申請了英國與西班牙的雙重國籍。
Felipe discovered that having dual citizenship made travel between his two home countries much easier.
Felipe 發現擁有雙重國籍讓他在兩個家鄉之間旅行方便許多。
- single nationality
citizenship of only one country
文法句型
dual + citizenship/nationality
用法筆記
Used exclusively with nouns meaning citizenship or nationality. Not used for other kinds of double belonging (e.g. not 'dual club membership' in this sense).
dual — 動詞
1. to widen or upgrade a single-carriageway road by adding a second lane in each di
改為雙車道
將單向車道拓寬成有分隔帶的雙向道路
to widen or upgrade a single-carriageway road by adding a second lane in each direction and a dividing barrier down the middle, so that traffic moving opposite ways is separated.
The local council plans to dual the main road to reduce traffic jams.
當地政府計畫將主要道路拓寬為有分隔帶的雙車道，以減少塞車。
dual as a transitive verb (chiefly UK)
The A12 was dualled last year, cutting the journey time by fifteen minutes.
A12 公路去年被拓寬為雙車道，通車時間縮短了十五分鐘。
The government spent millions to dual the highway linking the two port cities.
政府花費數百萬將連接兩座港口城市的公路拓寬為雙車道。
Campaigners are calling for the dangerous rural road to be dualled as soon as possible.
運動人士呼籲盡快將這條危險的鄉間道路拓寬為雙車道。
- widen
more general; 'widen' does not specify adding a central barrier or creating a dual carriageway
文法句型
dual [a road]
be dualled
用法筆記
Chiefly used in British English. The passive form ('the road was dualled') is more common than the active. The subject is typically a government body or transport authority.
dual — 名詞
1. a grammatical category, found in some languages, that is used when referring spe
雙數
語言中專指兩個事物或人的語法範疇
a grammatical category, found in some languages, that is used when referring specifically to two people or things — as distinct from the singular (one) and the plural (three or more).
Ancient Greek uses the dual for pairs of things, such as eyes or hands.
古希臘語使用雙數來指稱成對的事物，例如眼睛或手。
grammatical number for pairs
The dual is a rare feature in modern European languages, but it survives in Slovenian.
雙數在現代歐洲語言中很罕見，但在斯洛維尼亞語中仍保留下來。
Sanskrit has a well-developed dual that appears on nouns, verbs, and pronouns alike.
梵語有發展成熟的雙數系統，應用於名詞、動詞和代詞。
Students of Arabic must learn the dual because it affects how verbs agree with subjects.
學習阿拉伯語的學生必須學會雙數，因為它會影響動詞與主詞的一致關係。
文法句型
the dual
用法筆記
Uncountable — use 'the dual' to name the category itself. Contrast with noun sense 2, which refers to a specific word or ending within that category.
2. a specific word, suffix, or grammatical ending that expresses the dual number in
雙數形式
屬於雙數範疇的特定詞語或語法形式
a specific word, suffix, or grammatical ending that expresses the dual number in a language that has this category — for example, the suffix that marks a noun as referring to two items.
In Arabic, the suffix '-āni' is a dual attached to masculine nouns.
在阿拉伯語中，後綴「-āni」是附加在陽性名詞上的雙數形式。
countable instance of a dual form
Linguists compare how duals in different languages handle noun-adjective agreement.
語言學家比較不同語言中雙數形式如何處理名詞與形容詞的一致關係。
The Old English dual 'wit' meant 'we two' and was a distinct pronoun form.
古英語的雙數代詞「wit」意思是「我們兩個」，是一種獨立的代詞形式。
Slovenian duals are still used in everyday speech, not just in formal writing.
斯洛維尼亞語的雙數形式在日常口語中仍在使用，不限於正式書寫。
文法句型
a dual
duals (plural)
用法筆記
Countable — a single word or morpheme can be called 'a dual'. Use plural 'duals' when discussing multiple such forms across or within languages.