屋内

1. Origins, structure, and basic meaning

• Structure: 屋内 is read as おくない and is the inside of a building, or indoors.
• Basic usage: Use 屋内で演奏会を開く for holding a concert indoors and 植物を屋内に移す for moving a plant inside.

2. Common pitfalls and similar expressions

• Distinction between 屋内 and 室内
  • The headword contrasts the whole interior of a building with outdoors, while the comparison term more specifically means the inside of a room.