刀山剑树

Explanation: Buddhism says punishment of hell. Described as a very cruel punishment. 　　Usage: Joint type; as subject, object; metaphor very dangerous place 　　Source: "Agama nine beings living goods": "Let those who sin more hell when, ordered by the sword tree, train furnace carbon, copper melting endocytosis." 　　Examples: I did not like to go to hell, because not only is only ~ eyeful to see too monotonous, the pain may be afraid of hard when. (Lu Xun "canopy _set_ sequel Xiamen communication (b)") Thesaurus:  seas of fire and a forest of knifes-an extremely dangerous place which is most difficult to get through, Sword Tree Cutter Mountain, bluff, most dangerous places, Cliff Juebi