Zhongshan Station, China's second scientific research base on Antarctic ice sheet set up on Feb. 26, 1989, celebrates its 30th anniversary. (Photos: Xinhua)

Zhongshan Station, China's second scientific research base on Antarctic ice sheet set up on Feb. 26, 1989, celebrates its 30th anniversary.

Zhongshan Station, China's second scientific research base on Antarctic ice sheet set up on Feb. 26, 1989, celebrates its 30th anniversary.

Zhongshan Station, China's second scientific research base on Antarctic ice sheet set up on Feb. 26, 1989, celebrates its 30th anniversary.