偉業

1. Origins, structure, and basic meaning

• Structure: 偉業 (いぎょう) is a noun for a great achievement judged historically significant after sustained effort.
• Basic usage: 探検隊の偉業を紹介する makes an expedition’s achievement the object presented in an exhibit, while 歴史的な偉業となった evaluates the result of long research as momentous.

2. Common pitfalls and similar expressions

• Presented achievement and resulting appraisal
  • 偉業を紹介する explains an already recognized accomplishment, while 偉業となる marks a result attaining that appraisal. Merely attempting something difficult is insufficient.