Tourists board the wooden boats towed by boat trackers in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province, Aug. 17, 2010. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

The file photo taken in June 2009 shows boat trackers towing a wooden boat in water in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

Boat trackers sweat as they oar forward in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province, Aug. 17, 2010. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

Boat trackers tow the wooden boat forward in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province, Aug. 17, 2010. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

Boat trackers oar their way in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province, Aug. 17, 2010. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

The file photo taken in August 2009 shows boat trackers oaring their way in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

The file photo taken in August 2009 shows a boat tracker propelling a boat with scull in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua

Boat trackers tow the wooden boat forward in Shennongxi Canyon, a famous tourist resort of the Three Gorges scenic area, in Badong county, central China's Hubei Province, Aug. 17, 2010. Over 700 boat trackers are working in the canyon at present to showcase the time-honored boat-tracker culture. Photo: Xinhua