部分

1. Origins, structure, and basic meaning

• Structure: 部分 is read as ぶぶん and is a noun for a part, section, or area within a larger whole.
• Basic usage: Use it for a passage one does not understand or for only the damaged section of an object.

2. Common pitfalls and similar expressions

• Relation to the whole
  • 部分 presupposes a larger whole of which the named area or element is one part.
• Contrast with 一部
  • 部分 focuses on a distinct part within a whole, while 一部 emphasizes that something constitutes only part of the whole.