so far和by far的区别
区别就是两者意思是不一样，具体的不同如下
so far中文意思是到目前为止，迄今为止
So far eight workers have been killed.到目前为止已有8名员工遇难。
by far中文意思是到目前为止；远，非常（与比较级或最高级连用）
By far the largest cause of this human tragedy is that thousands of employees were heavily overweighted in Enron stock.
