SEO optimized/translated urls with language segment

[eluser]MV[/eluser]
Hi,

I finally managed to deal with routing and url but encountered a bit of a doubt:

- When dealing with urls like these:

www.site.com/pt/portuguese_word_here/other_word
www.site.com/en/english_word_here/other_word

where the first segment is obviously the language, is it common to translate the following segments of the url? Is it advisable?

or should i just consider some generic urls like:

www.site.com/pt/1/34/65
www.site.com/en/7/2/...

Is there a common practice? Advices?

I am assuming, out of probable ignorance that urls themselves could be "search engine food", meaning they could help to make the site noticed by crawlers, etc.?

Thanks.