确实没多大区别,都可以跟从句,都常用于书面语,意思也差不多,作文中基本可以互换.如果说有区别的话就是thus使用起来灵活一些,可以放在句末,可以和and连用,可以直接跟动词,可以独成一句.
They told her to water the flowers every morning,and she did it thus.
He didn't work hard.Thus he was fired.
He studied hard,and thus worked the problem out earlier than others.
另外,thus还有“这样的”的意思,具体例句参见
so that的用法参见