1. A flat shape with three straight sides and three angles = a triangle（三角形）

2. Three babies born at the same time from the same mother = triplets（三胞胎）

3. The third month = March （三月）

4. A group of three people or things that do things together = A trio（三人組）

5. He, she or it = third person singular（第三人稱單數）

6. Breakfast, lunch and dinner = three meals a day（每日三餐）

7. Melchior, Balthazar and Caspar (The Bible) = the three magi (three wise men)（三賢人）

8. A series of three films or books = a trilogy（三部曲）

9. three goals scored by the same player in the same game = a hat-trick（進3個球，即帽子戲法）

10. Athos, Porthos and Aramis = The Three Musketeers（三個火槍手）

*Athos、Porthos和Aramis是三個火槍手的名字