Build a custom MT system using a dictionary, which defines the word to be not translated, and their translation, which is the same as the source, in your case.
http://hub.microsofttranslator.com. See section 3.3 of the user guide for use of dictionaries.
Use contentType="text/HTML" and enclose the segments not to be translated with"<span class="notranslate"></span> or just apply the class="notranslate" attribute to an existing element that encloses the non-translatable
phrase. You can also use the regular HTML <code> element to enclose non-translatable phrases with. Note that contentType="text/HTML" requires complete and balanced HTML. If the source isn't balanced, the translation will be, which potentially
breaks XML nesting.
Let us know if this helps,
Chris Wendt
Microsoft Translator