as 是副词,介词,和连词
在一些语境下 as 可以接 动词+ ing
比如当 动词+ing = 形容词
请看例句：
John characterizes his time in New Yok as exciting and bewildering
As charming as she is,the girl's shrill voice is a turn-off for most men.
希望帮到了你,