单语范例（未经PONS编辑处理）
Below this, swift currents, braided channels, logjams, and overhanging or submerged vegetation make the float not a trip for beginners.
en.wikipedia.org The logjam had caused transportation difficulties for the people living alongside the river and dead fish were also seen on the river.
en.wikipedia.org This meant a logjam developed from time to time which necessitated week-end workings on the railway in order to reduce colliery stockpiles.
en.wikipedia.org The remains of this failure make up much of the logjam which lies in a bend in the cave, about 400 feet in.
en.wikipedia.org Breaking a logjam might involve one or more men working with hand tools, or it might involve explosives.
en.wikipedia.org