Translation
The differences in the training, skills, and talents needed for each job are vast. The key skill of a very good translator is the ability to write well, to express him/herself clearly in the target language. That is why professional translators almost always work in only one direction, translating only into their native language. Even bilingual individuals rarely can express themselves in a given subject equally well in two languages. And many excellent translators are far from being bilingual - they may not be, and need not be, fluent speakers of the source language (the language of the original text being translated). The key skills of the translator are the ability to understand the source language and the culture of the country where the text originated, and, using a good library of dictionaries and reference materials, render that material into the target language.