A slice of petal , a postcard , the beautiful remembrance when being old !
一片花瓣、一张明信片,都将是年老时美丽的回忆!
Another plausible theory held that if the internal ( adaxial ) face of each petal and sepal grew faster than the external ( abaxial ) face , the flower would eventually be forced to bend outward . In some plants , these mechanisms do drive the blooming process .