Wang Wenyi (1st R), a surviving forced miner who worked for Japan during the World War II, serves as voluntary visitor guide at a museum of Liaoyuan miners' tomb during Japanese occupation in Liaoyuan, Northeast China's Jilin province, Aug 28, 2014. The miners'tomb, which keeps 197 forced miners' remains, was an important evidence of Japanese crime of using forced Chinese labor between 1931 and 1945. No more than twenty of the forced miners in Liaoyuan are still alive today.[Photo by Wang Haofei/Xinhua]