TASK DEFINITION: Translate the given Spanish text to English
PROBLEM: Y1 is oxygen or hydrogen.

SOLUTION: Y1 es oxígeno o hidrógeno.

PROBLEM: The lift arms laterally close to grasp the drum.

SOLUTION: Los brazos elevadores se cierran lateralmente para agarrar el tambor.

PROBLEM: The invention relates to tumour therapy.

SOLUTION:
La invención se refiere a terapia tumoral.