The principles of the TARDIS' universal translator are depicted inconsistently throughout the series. It is supposed to translate everything into the traveler's own language, which should give everyone perfect British accents. Yet some characters in foreign countries speak with their own accents, such as Chinese or Italian, and "colourful" phrases like "apres vouz," "adios amigos," or "sayonara" are heard in their own languages. To say nothing of the Tenth Doctor's French catchphrase "Allons-y!"