dual

二重の、二つの

二つの役割や目的、立場などを同時に持つ。

やさしい英語で： Having two roles, purposes, identities, or other features at the same time.

• This room has a dual purpose.
• She has dual citizenship.
• His dual role as teacher and coach keeps him busy.

類義語： twofold, double

反対語： single

よく使う表現： dual role, dual purpose, dual citizenship

二つの、双式の

一緒に働く、または似た働きをする二つの部分を持つ。

やさしい英語で： Having two parts that work together or do similar jobs.

• The car has dual controls.
• Dual cameras allow the phone to capture more detail.
• This machine uses dual motors to lift heavy loads.

類義語： double, twin

反対語： single

よく使う表現： dual controls, dual motors, dual cameras

双数の

一部の言語で、ちょうど二人や二つを表す語形に関する。

やさしい英語で： Describing a word form used for exactly two people or things in some languages.

• This noun has a dual form.
• Arabic uses the dual number for pairs.
• The students compared singular, dual, and plural pronouns.

よく使う表現： dual number, dual form, dual pronouns

双対多面体

別の多面体の面と頂点を、つながりを対応させて入れ替えた多面体。

やさしい英語で： A solid shape made by exchanging another solid’s faces and corners, with matching connections.

• Every cube has an octahedral dual.
• We constructed the dual by placing a vertex on each face.
• The two polyhedra are duals of each other.

使い方： dual of something (The cube is the dual of the octahedron.)

よく使う表現： dual of something, regular dual, polyhedral dual