根据题目要求完成下列任务，用中文作答。 

下面是某高中教师的课堂教学片段。

T: Just now we get to know many different sports, for example...

Ss: Weight-lifting, fencing, aerobics, triathlon, shooting...

T: Great. Now, let's think about this question: How many types can these sports be divided into?

Ss: (discuss with partners)

T: For example, football, tennis, table-tennis, they belong to ...

S1: Ball games.

T: Great. And then ... How about rings? Double bars? Which type of sports do they belong to?

Ss: (silent)

T: (write "gymnastics" on the blackboard) Now read after me ...

S2: Ms Xia, how to say "kua lan" in English? It is the honor of all our Chinese people.

T: Yeah, we really ought to know 110-hurdle race. By the way, which type do both running and 110-hurdle race belong to?

Ss: (silent)

T: Let me tell you, track and field sports. Read after me.

Ss: (read after the teacher

T: Don't forget the sports that are done in the water--the water sports. So what are different types of sports we've learnt today?

Ss: Ball games, gymnastics, track and field and water games.

T: Excellent.