“as...as” 是一种英语表达，用于比较两件事物。“as” 后面可以接形容词或副词，说明两者之间的相似性。

　　以下是一些例子：

　　1. 接形容词：

　　- She is as tall as her brother.(她和她哥哥一样高。)

　　- The weather is as cold as winter.(天气和冬天一样冷。)

　　2. 接副词：

　　- He runs as fast as a deer.(他跑得和鹿一样快。)

　　- She works as diligently as her colleagues.(她和同事一样勤奋工作。)

　　在比较两件事物时，“as...as” 结构中的第二个 “as” 可以省略，例如：

　　- She is as tall as her brother.(她和她哥哥一样高。)

　　- She is tall as her brother.(她和她哥哥一样高。)

　　请注意，“as...as” 结构也可以用于否定句和疑问句，例如：

　　- She is not as tall as her brother.(她没有她哥哥高。)

　　- Is she as tall as her brother?(她和她哥哥一样高吗?)

　　此外，“as...as” 结构还可以用于表示数量或程度的相等，例如：

　　- Give me as much milk as sugar.(给我一样多的牛奶和糖。)

　　- The box is as big as a car.(这个盒子和汽车一样大。)