原级：cassette
1. When I bought some cassettes of Islamic prayers, the shop owner sent me another one as a gift.
2. But he knew there was a huge potential market for cassettes of popular music, even if he did not have many resources.
3. It is being also used in the filter cassettes installed on the water intake.
4. They admit to dumping the cassettes in the trunk after getting their licenses.
5. A ticket to the concert was priced at 5 yuan, and it included two cassettes of the group.