Sentence:  Outside the county towns of Lushui, Fugong, and Gongshan, few bridges span the Nu River Gorge, and most villagers cross the river by <WSD>zipline</WSD> cables or suspended footbridges to transport their crops or livestock to market. It is not uncommon to see sheep or cattle nervously thrashing about as they ride a <WSD>zipline</WSD> from one river bank to the other. 
Meaning of the word marked with <WSD> tags:  A pulley suspended on a cable mounted on an incline, designed to enable a user to travel from one point to another by means of gravity.