Norway -- Ten Chinese college students arrived at the country's Arctic  research base, the Yellow River Station, on Friday. On Saturday, the students are expected to witness the end of four months of darkness in the area, as the sun makes a rare appearance. During their four-day stay at the station, the students will meet and learn from some of China's leading polar researchers. They were welcomed at the station yesterday by its director, He Jianfeng, who is an expert on marine micro-ecosystems. The students will also visit the German and Norwegian stations and meet researchers there. As for entertainment, the visitors will get the chance to play ice hockey at the world's most northerly stadium. Among the visitors is Zheng Li, a student majoring in telecommunications at Dalian Marinetime University. "It is so exciting to see how the Chinese researchers work in the world's most northerly laboratory," she said. "This opportunity is precious. Most people will never get the chance to travel so far from home and visit such an amazing place. _  Wu Jinyou, head of the Polar Research Institute of China, and the group's leader, said, "I hope the students have not only a field trip to the Yellow River station, but are also touched by the devotion and spirit of the Chinese researchers here. I also expect in the future, some of them will choose to devote themselves to polar research and maybe even work with us." The students have been in Norway since February 28, and were given Arctic training before moving to the station. The Arctic expedition is one of the several international cooperation and exchange activities forming the China Program for International Polar Year (2007- 2008). It was launched last March. (China Daily, Xinhua News Agency, March 8, 2008) What does Zheng Li mean by saying "It's a once-in-a-lifetime thing."?
The trip to the research station is extremely exciting. It's exciting to see the sun rise in Arctic area. Playing ice hockey in Arctic area is really a life-long memory. People are only allowed to visit the station once in their lifetime.