It's sometimes hard to tell one twin from the other疑惑

It's sometimes hard to tell one twin from the other疑惑
我想要问的是,在此句翻译中,应该是很难从双胞胎中叫其中的一个.
但是,为什么是one twin from the other,而不是one twim from twins?
如果按原句,不应该是从另一个人叫一个人,不通啊.