残す

1. Origins, structure, and basic meaning

• Structure: 残す is read as のこす and means “to leave” and “to preserve”.
• Basic usage: It describes leaving cake for someone and preserving travel memories in photographs.

2. Common pitfalls and similar expressions

• ケーキを残す / 思い出を写真に残す
  • Distinguish leaving something unused in ケーキを残す from preserving it in a record in 思い出を写真に残す.