This is the 4712th most frequent Russian word.
жизней
"Жизней" means "lives" (genitive plural form of "жизнь").
In this sentence, 'жизни' is used as the plural form of the noun 'жизнь' (life) in the genitive case to refer to multiple lives collectively.
Чтение книг помогает обогащать наши жизни.
Reading books helps enrich our lives.
Here, 'жизней' is used in the plural genitive case to indicate possession or relation, referring to the lives being saved.
В спасении жизней важна каждая секунда.
In saving lives, every second is crucial.
In this example, 'жизней' functions in the plural genitive case to express the quantity of lives, emphasizing the magnitude of the impact.