therefore 和as的区别
therefore 是因此的意思，而as则是因为的意思，区别可以从以下例子看出：
As he is already 25 years old, has worked for over 5 years, therefore we believe he is mature enough to make decision. 因为他已经25岁了，已经工作了5年多，因此我们相信他已经成熟到可以做出决定了。
therefore 和as的区别
therefore是因此，as是因为、作为