用unnavigable造句子，“unnavigable”造句

Sitting on an unnavigable river in a valley of middling agricultural productivity, the city has been forced to prosper on ingenuity: fine craftsmanship, creative banking practices, slick diplomacy.

When the one chair in the room was at its usual place before the table, the canal was unnavigable.

By 1700 the Virginia frontier had been pushed as far west as the fall line-the point upstream at which the rivers emptying into the Atlantic became unnavigable.

And rural migrants took up bamboo poles and skeins of rope to join the so-called "stick-stick army" of porters, looking to haul bags of groceries or sacks of concrete mix along unnavigable inclines.