Abstract: A vehicle warning device is provided, which includes a detecting device, a processor and a plurality of spray devices. The detecting device detects an object near a vehicle and judging whether the object is a human body, if it is, the detecting device further detects the relative location between the human body and the vehicle and the distance between the human body and the vehicle. The processor further judges whether the relative location and the distance between the human body and the vehicle obstructs the passage that the vehicle can drive away, if it is, the processor transmits a start instruction to one of the spray devices corresponding to the human body to spray the stinky gas toward the human body to remind the human body to leave away from the periphery of the vehicle.

Abstract: A process for purifying pravastatin sodium comprising the steps of: a. clarifying a fermentation broth containing pravastatin sodium to obtain a clear solution; and adjusting the clear solution to be basic having pH value ranging from pH 10˜13; b. adsorbing the pravastatin sodium with non-ionic resin; eluting the pravastatin sodium by water-soluble organic solvent; and forming a concentrate of pravastatin sodium; c. treating the concentrate with water-soluble anti-solvent or inorganic salt to form a precipitate of pravastatin sodium; and d. recrystallizing the precipitate for making pravastatin sodium crystal with high purity and high yield.

Abstract: A process for purifying pravastatin sodium comprising the steps of: