延長

1. Origins, structure, and basic meaning

• Structure: 延長(えんちょう) is a noun for extending an existing duration or physical length.
• Basic usage: It applies to time in 試合時間が延長される and to a structure in 橋の延長工事.

2. Common pitfalls and similar expressions

• Time and length
  • It can extend a period such as game time or a physical structure such as a bridge.
• Action and result
  • Use 延長する for the act of extending and 延長される when the focus is on the thing being extended.