Growing popularity A tenuous line separates success and failure in this sport. River trekking is much more dangerous than other extreme sports, like rock climbing and bungee jumping.
溯溪人數──逐年攀升成也、敗也，一線之隔，比起其他像是攀岩或者高空彈跳等極限運動，溯溪的危險性更高。