The dutch invented the word " polder " centuries ago to describe dry land created by enclosing floodplains ( or shallow waters ) with dykes .
荷兰人几百年前发明了“开拓地”这个词,专指围住泛滥平原和大坝(或浅水)产生的干旱土地。
Rothlisburger proposed a theory of how an equilibrium develops between the external forces of the enclosing glacial structure and the internal pressure , ( flow and frictional melt rate ) of the water inside .