[誤] Though the two brothers are twins, their dispositions are quite different.
[正] Though the two brothers are twins, their dispositons are as like as chalk and cheese.
注:雖然是“不同”,但卻不用 different,而是用 alike(相同的)。chalk 和 cheese 形似而實不同,這看似矛盾的措辭用在這里倒能產生令人難忘的效果。