Usages of el cartucho
La pluma no tiene tinta, y no hay de dónde sacar un cartucho.
The pen has no ink, and there is nowhere to get a cartridge from.
Ahora bien, compré el cartucho, pero no hay en qué llevar el bloc.
Now then, I bought the cartridge, but there is nothing to carry the notepad in.
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We have an entire course teaching Spanish (Latin America) grammar and vocabulary.