You should have necessary competencies, know how to render the meanin expressed by means of a source language using target language, know the norms (grammatical for ex.) of the two languages, etc. Moreover it is highly recommended to chose one technical area for your job in order to be an expert there, because a good technical translator should know how it works and understand the details of the field. Another this is knowing standarts of translation and the criterea of a good translation (try to google TAUS anf Gala Global). And one more point is CAT instruments, which enable you to save time and increase quality.
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