therefore vs. thereby

辨析：两者都是连接副词，都带有“因此”的含义。但是前者含有主动的意味，后者较为罕见，强调的是客观衍生的结果。

例句：
I wanted to know the difference between two English expressions and therefore started a thread in the forum to get an answer.
I received only one answer and thereby was unable to fully understand the difference.