"you were not supposed to show your navel on television" "they argued whether or not Adam had a navel" "she had a tattoo just above her bellybutton"
"the Incas believed that Cuzco was the navel of the universe"
Cyprus was the navel of Byzantine culture.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)