目玉

1. Origins, structure, and basic meaning

• Structure: Spelling: 目玉. Reading: めだま. Core meaning: eyeball; featured product.
• Basic usage: Representative examples: 魚の目玉を観察し、光の入り方を調べた / 今季の目玉商品は、軽くて丈夫な旅行かばんだ.

2. Common pitfalls and similar expressions

• Body part and featured item
  • The word has a literal sense for an eyeball and a figurative sense for a featured item that attracts attention. In 目玉商品, it denotes a promotional centerpiece, not an actual eye.