減少

1. Origins, structure, and basic meaning

• Structure: 減少 (げんしょう) combines reducing 減 and becoming fewer 少 to denote a decrease or decline.
• Basic usage: It describes fewer park visitors and efforts to prevent further loss of users.

2. Common pitfalls and similar expressions

• Observed decline and prevention
  • 減少した reports a completed downward change, while 減少を防ぐ targets a decline that may otherwise occur.