Many plants are exotic, and some are introduced from some small countries outside the Central Plains, which is the so-called barbarian land. So with tomatoes, guava, annona and other fruits, rape flowers first fell from the sky. Of course, this is purely a legend, or a story of utilization. At first, a fairy almost drowned while playing with water on earth, and was saved by a young man. The young man's family is too poor. In order to repay her for saving her life, it is estimated that the heaven also has the ideological education that the grace of dripping water should be rewarded by the spring, so I went to the sky to pick the stars and let the young man plant them in the ground. The next year, the stars came out, and the small yellow flowers were full of extraordinary gains. This is the future traitor. When he saw the young man's harvest, he got his wish and returned to the sky with confidence. It is said that this is the origin of rape. There must be such a thing!