Atranslation or rotation is a composition of two

Reflections

Explanation:

1- For translation:

A translation can be a composition of a reflection as it can composed by two reflections over parallel lines.

These lines should be separated by a distance equal to half the distance of translation

2- For rotation:

A rotation can be a composition of a reflection as it can composed by two reflections over non-parallel lines.

These two non-parallel lines should intersect at the point representing the center of rotation

Hope this helps :)