explain管 （644） 8

15 mins 26 secs

13 mins 20 secs

13 mins 17 secs

13 mins 19 secs

6 mins 8 secs

17 mins 53 secs

5 mins 14 secs

7 mins 57 secs

15 mins

17 mins 53 secs

17 mins 53 secs

19 mins 48 secs

20 mins 1 sec

6 mins 12 secs

6 mins 15 secs

7 mins 45 secs

17 mins 8 secs

12 mins 19 secs

1 min 55 secs

17 mins 44 secs

4 mins 8 secs

14 mins 49 secs

11 mins 14 secs

15 mins 41 secs

20 mins 1 sec

17 mins 56 secs

10 mins