Translation is just not words or language but about what every single word in a language is about. The job of a translator is certainly not an easy one.
He needs to fair well in everything, every concept, science, technology and everything from top to bottom existing in this greatly diversified globe.
It is him who brings people together in some common fields. Take for example, the medicine field.
For every doctor a human body is human body and there cannot be a change or a different name to this.