foal是驹的意思，而horse则是马的意思，区别可以从以下例子看出：

　　Foal is young horse, they need to grow up, then become horse, like children growing up become man and women. 小马驹是小马，它们需要长大，然后变成马，就像孩子长大后变成男人和女人一样。