IELTS TUTOR lưu ý:

• Doubling: the act of increasing by twofold. (IELTS TUTOR xét ví dụ: The teacher assigned a doubling of the usual amount of homework for the weekend.)
• Doubly: to a double extent or degree; twice. (IELTS TUTOR xét ví dụ: She felt doubly nervous about the presentation because it was in front of a large audience.)
• Doublet: a pair of similar or identical things. (IELTS TUTOR xét ví dụ: The matching doublets were the perfect gift for the twin brothers.)  >> IELTS  TUTOR  hướng  dẫn  Cách dùng tính từ"identical"tiếng anh 
• Double-cross: to betray someone by breaking a promise or agreement. (IELTS TUTOR xét ví dụ: He double-crossed his business partner by starting a competing company.)
• Double-dealing: the practice of being deceitful or untrustworthy in one's actions. (IELTS TUTOR xét ví dụ: The politician was accused of double-dealing by making promises to both sides of the issue.)