郵便

1. Origins, structure, and basic meaning

• Structure: Spelling: 郵便. Reading: ゆうびん. Core meaning: mail; post.
• Basic usage: Representative examples: 郵便で届いた手紙を机の上に置いた / この村には午後に一度だけ郵便が来る.

2. Common pitfalls and similar expressions

• Means and delivered mail
  • In 郵便で届く, it names the delivery method; in 郵便が来る, it refers to the arriving mail or postal service. Do not limit it to one individual letter.