常見(jiàn)例句

• Her letter were writeen in a happy strain.
  她的信是用快樂(lè)的筆調(diào)寫(xiě)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。
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