A friend of mine learned this thing last year. He went to Chengdu Manlu Printing Training College from Guangzhou. I remember many friends opposed him going so far away. Presumably, the printing industry in Guangdong should be more developed than that in the southwest. He and Mr. Man Lu had a period of network contact and technical exchange. He felt that he trusted him, so he went to study and came back in less than two months. It seems that he has learned well, too. This year's salary is probably high, and he trained Manlu.