a swallow nesting on a canopy-be in a precarious position ? 夫子之在此也，猶燕之巢于幕上。(《左傳·襄二十九年》) He lives here like a swallow which has built its nest in a tent.
燕巢幕上yan chao mu shang
a swallow nesting on a canopy (in a precarious position)
燕巢幕上yàn cháo mù shànɡ
巢：窩；幕：帷幕。燕子把窩造在帷幕上面。比喻處境十分危險。unaware of its danger, in a precarious position, in a dangerous position