I want an apple.

我想要一个苹果。

...2kg cooking apples.

两公斤烹调用的苹果

...his ongoing search for the finest varieties of apple.

他对最优种苹果坚持不懈的寻找

...a large garden with apple trees in it.

种着苹果树的大果园

Penny's only son was the apple of her eye.

彭妮的独子是她的心肝宝贝。