橘子是可数名词还是不可数名词

　　I plucked an orange from the tree.

　　我从树上摘了一个橙子。

　　An orange a day will give you all the vitamin C you need.

　　每天吃一个橙子能充分摄取所需的维生素C。

　　The outer skin of the orange is called the 'zest'.

　　橙子皮称为zest。

　　Peel a thick-skinned orange and square off the ends with a sharp knife.

　　剥开一只厚皮橙子，用锋利的刀将两端削去使它呈方形。

　　Squeeze a bit of orange juice onto the meatballs.

　　往肉丸子上挤点橙子汁。