Translate the given Spanish text to English

Example Input: Systems for showing such relationships are described.
Example Output: Se describen sistemas para mostrar tales relaciones.

Example Input: This results in greater smoothness, better hand, and more comfort.
Example Output: Esto conduce a una lisura mas grande, mejor tacto y mayor confort.

Example Input: When X is 2-valent, q is 0 and when X is 4-valent, q is 1.
Example Output:
Cuando X es divalente, q es 0 y cuando X es tetravalente, q es 1.