解释 trace.....back......

trace back:

追溯

例句与用法:
1. Her fear of water can be trace back to a childhood accident.
她很怕水，起因可归于儿时的一次事故。

2. The assiciation between our two countries can be traced back to last century.
我们两国之间的往来可以追溯到上个世纪。