燕巢危幕

Explanation: Swallows to nest in the curtain to do. Metaphor very dangerous situation. 　　Source: "Zuo Xianggong Twenty-nine years," Master of this, it still swallow's nest on the screen. " 　　Examples: Somehow I suddenly remembered - "the story, see this a lot of people, not help but be sad. ★ Lu Xun's" two books "Ninth Five Thesaurus:  Yanchao fly screen, Yanchao on screen, Yanchao supratentorial, yanmu, yanmu