Английский ⇄ Вьетнамский Русский +

Английский тезаурус
observation ['ɔbzə'veɪʃ(ə)n] сущ.
воен., логист.	The condition of weather and terrain that permits a force to see the friendly, enemy, and neutral personnel and systems, and key aspects of the environment. (FRA)
сокр.	obbo; observ; obsv
сокр., воен.	obsn; obsr