This is an audio file from BBC World Service.

http://www.bbc.co.uk/programmes/p025k6wq

Bilingualism is extensive and yet it is surrounded by myths.
[…There are also the myths that real bilinguals do not have an accent in their different languages and that they are excellent all-around translators. This is far from being true. Having an accent or not does not make one more or less bilingual, and bilinguals often have difficulties translating specialized language… continue reading

Source: Psychology Today

Reference: Grosjean, François (2010). Bilingual: Life and Reality. Cambridge, Mass: Harvard University Press.