German girl Christa Maria Idel donates her Rh-negative blood to save a 75-year-old woman in Wenzhou, Zhejiang province, on Tuesday. Provided To China Daily

There are 4,000 "panda blood" carriers registered at the provincial blood center, but only tens of carriers are in Wenzhou and can be contacted, and the hospital was unable to find enough blood for one transfusion.

Gao decided to help Kong.

In the middle of last month, Gao skipped class and took a high-speed train to Wenzhou, a southern city she had never heard of about four hours from Hangzhou, the capital of Zhejiang province.

"I met the family. They said 'thank you' to me many times, but I don't think it is a big deal," she said.

Born in Krefeld, Germany, Gao studied at the University of Goettingen, majoring in Chinese and sports. She had been learning Chinese for two years and came to Zhejiang University as an exchange student to improve her Chinese ability.

"My father is a doctor and always tells me to help those in need. On the train back to the university, I felt great happiness," she said.

However, after finding out on the weekend that Kong had failed to find enough donors for her latest transfusion, Gao went to Wenzhou on Tuesday and volunteered to donate her blood again, without hesitation.

"I feel that I have a special connection with Wenzhou and the family now," she said.