Here is an example of Google translator's troubles:
I asked to to translate this:
quote:
hey there, stuff like this will not be translated correctly. The translation only translates words it knows.
The result into French was:
quote:
hé là, la substance comme ceci ne sera pas traduite correctement. La traduction traduit seulement des mots qu'elle sait.
After translating back:
quote:
hé there, the substance as this will not be translated correctly. The translation translates only words which it knows.
Longer pieces of text turn out worse