Translation guide
How to express that something consists of two parts in Japanese, depending on whether you are counting parts, describing a two-part structure, or referring to a two-part series.
The speaker wants to say that something has or is made of two parts, pieces, or components.
A straightforward way to say 'two parts' when referring to components or sections. 二つ (futatsu) is the native Japanese counting word for two things, and 部分 (bubun) means 'part'.
この問題は二つの部分に分けられます。
This problem can be divided into two parts.
The speaker refers to something like a book, movie, or event that comes in two installments.
Commonly used for a two-part story or article: 前編 (zenpen) is the first part, 後編 (kouhen) is the second part. Often used together or separately.
その記事は前編と後編に分かれています。
The article is divided into part one and part two.
The speaker wants to express a proportion, such as in a recipe or mixture, where something is made of two parts of one thing and some parts of another.
Used for ratios. 'Two parts to one part' is 2対1 (ni tai ichi). This pattern can be extended to other numbers.
水と酢を2対1の割合で混ぜる。
Mix water and vinegar in a ratio of two parts to one.
二つ (futatsu) is the general counter for two items and is used with 部分 (bubun) for 'two parts'. 二部 (nibu) is used in compounds like 二部構成 (nibu kousei) for a two-part structure. 二分割 (nibunkatsu) emphasizes the act of dividing into two parts.
ケーキを二つに分ける。
Divide the cake into two (pieces).
レポートは二部構成だ。
The report has a two-part structure.
データを二分割する。
Split the data into two parts.
Used for a two-part structure or composition, often for documents, performances, or systems. 二部 (nibu) means 'two parts' and 構成 (kousei) means 'structure'.
この映画は二部構成です。
This movie is in two parts.
Refers to splitting something into two parts, often used in technical or formal contexts. 二分割 (nibunkatsu) literally means 'two-part division'.
画面を二分割して表示する。
Display the screen split into two parts.
Specifically for a two-volume book set: 上巻 (joukan) is the first volume, 下巻 (gekan) is the second volume.
この小説は上下巻で出版された。
This novel was published in two volumes.
A two-part work, such as a film or novel. 二部作 (nibusaku) literally means 'two-part work'.
あの映画は二部作の第一部です。
That movie is the first of a two-part series.
Literally 'a proportion of 2', used when the other part is understood or mentioned separately. Often used in cooking.
砂糖を2の割合で加える。
Add sugar in a proportion of two parts.