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установлена

has been installed, has been established

→ установить
adjective · feminine singular · past Rare #44,125
has been installed Short-form passive participle (feminine); used like a predicate (e.g., “X установлена”).
RU: Новая дверь уже установлена.
EN: The new door has already been installed.
has been established Short-form passive participle (feminine); often used about a rule, procedure, or order.
RU: Причина аварии установлена.
EN: The cause of the accident has been established.

Личность преступника пока не установлена.

The identity of the perpetrator has not yet been established.

— Прокол (1981)

Видишь, она уже установлена.

You see, it's already installed.

— Нет (2012)

Разумеется, его личность не установлена.

Of course, his identity has not been established.

— Дзета (2026)

Личность подозреваемого установлена?

Has the suspect been identified?

— Преследователь (2008)