The combined photo shows Chu Qingfang, Liu Qixiang, Wang Zhigong and Sun Yuanxin (up, L to R), surviving forced miners who worked for Japan during the World War II, and the file photo taken in 1943 (down) of forced miners working in a mine in Liaoyuan, Northeast China's Jilin province. The museum of Liaoyuan miners' tomb during Japanese occupation, 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]