presentation管 （1215）

7 mins 3 secs

2 mins 45 secs

1 min 11 secs

20 secs

8 mins 5 secs

4 mins 21 secs

1 min 58 secs

36 secs

1 min 9 secs

3 mins 45 secs

1 hour 43 mins 46 secs

6 mins 15 secs

1 min 25 secs

5 mins 1 sec

38 mins 44 secs

5 mins 56 secs

15 mins 57 secs

1 min 37 secs

10 mins 9 secs

2 mins

9 secs

1 min 26 secs

1 min 26 secs

58 secs

1 min 25 secs

7 secs