天昏地黑

Explanation: See "incredibly hard." 　　Source: Han Yu Tang "Long shift" stunning in black dragon poetry day shift, with the thunder shock electric shock female and male. "Mingling 濛 early" first moment Pai An Jing Qi, "Volume II heard a gust of wind at fourteen, days, faint to dark, Amityville Horror, the immediate pitch-dark, and sometimes fainted." 　　Examples: Try a look at rural life, the time when busy, busy housewife is to ~. ★ Tao "declaration of the creation of rural kindergartens"