Checkpoint
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 13:29的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/checkpoint ref] check + point == etymonline == [https://www.etymonline.com/word/ch…”的新页面）
wiktionary
check + point
etymonline
checkpoint (n.)
1940, from check (v.1) + point (n.). Originally an aviator's term for landforms or structures of known height against which the craft's altitude could be visually checked. The "place where travelers are stopped and subject to security checks" sense is recorded from 1950.
