, FOYLE, Anthony M., and NABER, Michael D., (1) 3891 Churchview Avenue, Pittsburgh, PA 15236, dat5118@psu.edu, (2) School of Science, Penn State Erie - The Behrend College, 4205 College Drive, Erie, PA 16563TEDESCO, Domenic Armand...
Last summer, I went to a river trek (徒步旅行) with some British friends. The river was not wide, but it was running fast. The rocks in the river were so slippery (滑的) that it was hard for us to walk. We walked carefully, but our shoes and trousers were still wet. I was get...