explain管 （748） 11

2 mins 16 secs

1 min 10 secs

6 mins 52 secs

6 mins 15 secs

6 mins 31 secs

8 mins

5 mins 40 secs

7 mins 33 secs

23 mins 7 secs

7 mins 45 secs

8 mins

17 mins 42 secs

10 secs

2 mins 9 secs

7 mins 58 secs

12 mins 56 secs

2 mins 55 secs

10 mins

8 mins

20 secs

7 mins

13 mins 9 secs

12 mins 1 sec

14 mins 12 secs

33 mins 42 secs

15 secs

10 mins