restrospect to; trace back to

1. 要探討愛爾蘭問題的起因就要追溯到三百多年以前。
   To trace the origins of the Irish problem, we have to go back over three hundred years.
2. 這個家族的歷史可以追溯到十七世紀。
   The family can trace its history to the 17th century.
3. 子孫，后代其血統(tǒng)可追溯到某特定個體或群體的人、動物或植物
   A person, an animal, or a plant whose descent can be traced to a particular individual or group.
4. 我們兩國之間的往來可以追溯到上個世紀。
   The assiciation between our two countries can be traced back to last century.
5. 這個城堡可追溯到羅馬時代。
   This castle dates back to Roman times.

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