one/wʌn/1一the number 1I have one book.我有一本书。I only have one pen in my bag.我的包里只有一支笔。She has one brother and two sisters.她有一个兄弟和两个姐妹。There is only one seat available on the bus.公交车上只有一个座位可用。He has one pet dog named Max.他有一只名叫马克斯的宠物狗。同义词: singleunityIace