改良

1. Origins, structure, and basic meaning

• Structure: 改良 is read as かいりょう and is a noun and する verb for improving a machine, variety, or other object.
• Basic usage: Improving a machine appears in 機械を改良する, while a crop arising through variety improvement appears in 品種の改良によって作物が生まれる.

2. Common pitfalls and similar expressions

• Object and cause of a result
  • Use を for the item improved and によって for the cause of a result.
• Difference from 改善
  • 改良 readily refines an object or variety rather than a problematic state in general.