Russian ⇄ English

лбом стенку не прошибешь stresses
proverb	used to mean: you'll never overcome that obstacle, it's too big for you you can't knock down a wall with a pea-shooter
лбом стенку не прошибёшь
gen.	it's no use beating your head against a brick wall
proverb	you can't break down walls by beating your head against them