Zhu Jing shows his collection of certificates for donating blood in Jinan, East China's Shandong province on June 11, 2012. Zhu Jing has voluntarily donated 42.2 liters of blood during the past ten years, which is equal to entire blood of nine adults. In order to maintain healthy blood, the 32-years-old man from Shandong province always stays away from tobacco and strong alcohol. He also eats more vegetable and less meat as well as making sure he has enough sleep four days before his donation. [Photo/Xinhua]