今天我们要学的词是 date back. Date back 追溯到。An Australian commission is investigating complaints about students at a military academy being sexually abused that date back to the 1970s. 澳大利亚一个委员会就一所军校学生被性虐事件展开调查，据悉这种情况可以追溯到上世纪70年代。Archaeologists unearthed a campsite in Canada that could date back 12,000 years. 考古学家在加拿大挖掘出一片古营地，其历史可以追溯到一万两千年前。好的，我们今天学习的词是 date back, date back, date back...