回天无力

Explanation: Back to the day: metaphor is power, to transfer difficult to reverse the trend of the times; weakness: no power. Parable situation or a serious condition, has been unable to save. 　　Source: Qing Feng Feng effect "from the past autumn Picks Liu Mourning": "after the probe was in consumption, thousand arrows save the heart, internal organs torn to shreds. But the die was cast, beyond resurrection." 　　Examples: My family will be the well-known species, the Department of clearing the door, Xianjun patriotic Rufen, ~. (Qing Liang "Love in mind the legendary Xia Wei concern")