n.[C]

1. 雙胞胎之一
   He is the younger twin of the two.

   他是這對雙胞胎中的弟弟。

2. 雙胞胎；孿生兒[P]
   She gave birth to twins.

   她生了雙胞胎。

3. 兩個極相似的人（或事物）；兩個關係極密切的人（或事物）[P]
4. （有成對單人床的）雙人房間
5. 雙子星座[the P]

a.[Z][B]

1. 孿生的
   She is Claire's twin sister.

   她是克萊兒的孿生姊妹。

2. 非常相似的；成對的
   The government has to deal with the twin issues of inflation and unemployment.

   政府必須對付通貨膨脹與失業這兩個密切相關的問題。

3. 雙重的
   The plan has a twin purpose.

   這一計畫有雙重目的。

vt.

1. 使成對；使偶合
2. 使結成姐妹市[（+with）]
   Our city is twinned with Seoul.

   本市與首爾結成姊妹市。

vi.

1. 生雙胞胎
2. 成對；偶合[（+with）]

n.

1. one of two children or animals born at the same birth.
2. something containing or consisting of two matching or corresponding parts.

adj.

1. forming or being one of a twin.
2. forming a matching or closely connected pair.
3. (of a crystal) twinned.

v.

1. link; combine.
   ▸Brit. link (a town or district) with another in a different country, for the purposes of cultural exchange.
2. [as adj. twinned] (of a crystal) that is a composite consisting of two (or more) parts which are reversed in orientation with respect to each other.