You can translate inter- and intra- to and respectively.
(Note that they become suffixes rather than prefixes in Japanese.)
References:
* I read dainichi's comments above;
* I found this answer on ye olde Bag o' Wisdom;
* I looked for patterns in the inter- and intra- words in my Kenkyusha J-E dictionary; and
* I briefly checked Google to see if the patterns seemed correct.