追根溯源

Explanation: Refers to the root of things happen retrospectively. With trace to its source. " 　　Source: Xiao Jian, "city mayor no room to live" In fact, if traced, he was upright in order to make yourself more moved into the mayor floor, while the former will not drop a Xiemoshalv, swept out of notoriety. " Thesaurus:  Barbarism To end, Barbarism Anti-end