as和for的用法As they are great hunters,snowy owls were considered a sign of bravery.这个as为何不能换成for

as和for的用法As they are great hunters,snowy owls were considered a sign of bravery.这个as为何不能换成for as for 的用法 As to 和 As for 的用法有什么区别? for instance 和such as的用法 as……as 和as soon as的用法 as as的用法 as as的用法 as long as的意思和用法 such as ,like ,for example ,for instance ,as if 的区别和用法 老师好,请问such as , like , for example , for instance , as if 的区别和用法 as...as...和the same as...的区别和用法 Because , Since , . As , For 的意思和用法 Because ,Since ,.As ,For 的意思和用法 be known as/for/to/by 的用法和区别, as 和 for 做“因为”讲时的用法区别? such as 和 for example 的用法与区分 像as,since,for,等等介词的意思,和用法, sush as,for example,liked的用法和区别是什么?