本课程为收费课程，购买后即可观看完整内容
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- 00:00 免费1、Learn Letter A
- 00:00 付费2、Learn Letter B
- 00:00 付费3、Learn Letter C
- 00:00 付费4、Learn Letter D
- 00:00 付费5、Learn Letter E
- 00:00 付费6、Learn Letter F
- 00:00
付费7、Learn Letter G - 00:00 付费8、Learn Letter H
- 00:00 付费9、Learn Letter I
- 00:00 付费10、Learn Letter J
- 00:00 付费11、Learn Letter K
- 00:00 付费12、Learn Letter L
- 00:00 付费13、Learn Letter M
- 00:00 付费14、Learn Letter N
- 00:00 付费15、Learn Letter O
- 00:00 付费16、Learn Letter P
- 00:00 付费17、Learn Letter Q
- 00:00 付费18、Learn Letter R
- 00:00 付费19、Learn Letter S
- 00:00 付费20、Learn Letter T
- 00:00 付费21、Learn Letter U
- 00:00 付费22、Learn Letter V
- 00:00 付费23、Learn Letter W
- 00:00 付费24、Learn Letter X
- 00:00 付费25、Learn Letter Y
- 00:00 付费26、Learn Letter Z