盛ん

1. Origins, structure, and basic meaning

• Structure: 盛ん, read さかん, describes vigorous activity or movement.
• Basic usage: It is used for a flourishing local industry or children actively playing.

2. Common pitfalls and similar expressions

• State and manner of acting
  • 産業が盛んだ describes an industry as active, while 盛んに活動する describes acting vigorously.