as加到动词的过去分词前面组成的新单词是什么意思啊?例如：as-prepared 和as-obtained.

as=如;
as usual=照常
as attached = 如附件
as prepared = 如所准备的...
as obtained = 如所取得的...
补充:"as-prepared" 的中间没有必要加连字符号.