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。
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.
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.
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