This is the 1351st most frequent Russian word.
apple
The Russian word "яблоко" means "apple" in English.
The word "яблоко" is used here as the direct object of the action of buying.
Я купил одно красное яблоко в магазине.
I bought one red apple in the store.
The word "яблоко" is used as the subject of the verb "grows."
В саду растет красивое яблоко на дереве.
In the garden, a beautiful apple grows on the tree.
"яблока" is in the genitive case, indicating a part of the whole.