Usually a language is translated from a foreign tongue into a translator's native tongue. Due to the large number of languages, some being minor ones, since 1995 interpreting is sometimes done the opposite way, out of an interpreter's native tongue (the "retour" system). In addition, a speech in a minor language may be interpreted through a third language for lack of interpreters ("relay" interpreting) for example, when interpreting out of Estonian into Maltese. Due to the complexity of the issues, interpretation is not word for word. Instead, interpreters have to convey the political meaning of a speech, regardless of their own views. This requires detailed understanding of the politics and terms of the Parliament, involving a great deal of preparation beforehand (e.g. reading the documents in question). Difficulty can often arise when MEPs use profanities, jokes and word play or speak too fast.