petal  
noun [ C ] uk/ˈpet.əl/ us/ˈpet̬.əl/
  (ON FLOWER)      
  花瓣
any of the usually brightly coloured parts that together form most of a flower
  rose petals 玫瑰花瓣 
   (PERSON)      
 UK informal宝贝,乖乖(尤用于称呼女性或孩子) 
a friendly way of talking to someone, especially a woman or child
  What did you say, petal? 你说什么,宝贝儿?