常見例句Her letter were writeen in a happy strain. 她的信是用快樂的筆調(diào)寫的。The union of A and B, writeen as AUB, is the set of elements which belong to A or B or to both. A與B的并集記為AUB，是屬于A或?qū)儆贐，或同時(shí)屬于兩者的元素的集合。 返回 writeenable