“另一个”如表示剩余的一个,用the other one(或the other);
“另一个”如表示剩余的多个中的一个,用another one(或another).
例如:
如果有两个苹果,一个给别人,“另一个”自己留,就说:
You can take one of the two apples and I'll take the other (one).
如果有三个苹果,两个给别人,“剩下的另一个”自己留,说:
You can take two of the three apples and I'll take the other (one).
如果有多个苹果,你叫别人拿一个,自己拿“另一个”,还有剩下的,说:
There are several apples.You can take one and I'll take another (one).The rest of the apples will go to my wife.