上溯，拼音shàngsù，汉语词语，从当前向以往推；逆水而上。
该城的历史可以上溯到公元1500年以前。
如果某些翼手龙身上的“绒毛”被证实的确为羽毛的话，那羽毛的起源就可以上溯到更为远古的年代。
If the "fuzz" on some pterodactyls is indeed confirmed to be feathers, the origin of feathers can be traced back to more ancient times.
再往上溯到大船渡，港口的拖船仍停泊在离水约一公里的某户人家的后院。
Further up the coast in Ofunato, the port's tugboat still sits in someone's backyard about a kilometer from the water.
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