instruction:
Translate the given Spanish text to English
question:
A catalyst may be used during the process.
answer:
Se puede usar un catalizador durante el proceso.


question:
Two wheels support the bottom.
answer:
Dos ruedas sostienen la parte inferior.


question:
The method comprising: providing the radially inner portion (11) in the form of an inner tube (21) and assembling the radially outer portion (13) about the inner tube (21).
answer:

El método comprende: proporcionar la porción radialmente interna (11) en la forma de un tubo interno (21) y montar la porción radialmente externa (13) alrededor del tubo interno (21).