Grapefruit, also named as Wendan, is a mature fruit of pomelo trees which is an evergreen fruit tree of rutaceae plant, it is rich in many places in our country, such as Fujian, Guangdong, Guangxi and Jiangxi. 柚子,又名文旦,为芸香科植物常绿果树-柚树的成熟果实,在我国资源丰富,广泛分布于福建、广东、广西、江西等地。