丸泥封关

Explanation: A little mud mud pill, less metaphor; closure blocked. Described as difficult terrain, as long as a small amount of troops can guard. 　　Usage: The main predicate; as attribute; describe the difficult terrain 　　Source: "Han Wei Xiao Chuan" Yuan asked a pill for the big mud Wang Feng Hangu Pass. " 　　Examples: Still willing to ~ and then closed for a Thousand Years, the rainy weather took a new good, long time is to look at flowers. ★ clear s "The Cherry Song" poem Thesaurus:  Man guards the pass, One man can hold this pass to guard against ten thousand enemies., Wanfumocui