as和for的用法As they are great hunters,snowy owls were considere

as和for都有“因为”的意思.但是as比for的语气弱.as用来表示显而易见的原因,而for却有一种解释说明的语气.
例：as it is raining,we have to call of the meeting.
please forgive him,for he is only 13 years old.