keep at it

Translations
не сдаваться
He was tired, but he knew he had to keep at it to succeed.
Он устал, но знал, что должен не сдаваться, чтобы добиться успеха.
Definitions
To continue working hard at something, especially when it is difficult or takes a long time; to persist or persevere.
Words
keep

verb
продолжай
at

preposition
в
it

pronoun
это