as....as...什么意思‘

as...as表示同级比较，中间用形容词或副词的原级。其中的第一个as是副词，第二个as是连词，常用于引导一个比较状语从句，从句中常省略与主句相同的成分。
如as cold as ice 像冰一样冷。
as fast as could 尽可能快

和....一样

像……一样

as..as 用于肯定句
so..as用于否定句

He is as tall as Tim.

She is not so pretty as Lynn.