Definition: Translate the given Spanish text to English

Positive Example 1 -
Input: A method for converting a series of m-bit information words to a modulated signal is described.
Output: Se describe un método para convertir una serie de palabras de informacion de bits m a una señal modulada.

Positive Example 2 -
Input: A last plastic cover is applied as a final protection.
Output: La presente invencion comprende un nuevo mezclador termocinetico.

Negative Example 1 -
Input: Luminescent optical sensor.
Output: SENSOR OPTICO LUMINISCENTE.

Negative Example 2 -
Input: The urinal is similar to a common toilet.
Output: El común es similar a un inodoro orinal.

Now complete the following example -
Input: A laddertube (10) for an underground raise is described having an elongate tube (12) made of a suitably rigid plastics material and adapted to be received in the raise.
Output: Se describe una escala-tubo 10 para pozo subterráneo, que tiene un tubo alargado 12 fabricado de un material plástico suficientemente rígido y adaptado para ser recibido en el pozo.