Translation is a two-edged instrument: it has the special purpose of demonstrating the learner's knowledge of the foreign language, either as a form of control or to exercise his intelligence in order to develop his competence.
There is no such thing as a perfect, ideal, or 'correct' translation. A translator is always trying to extend his knowledge and improve his means of expression; he is always pursuing facts and words.
A satisfactory translation is not always possible, but a good translator is never satisfied with it. It can usually be improved. (Newmark)
