"I eat an orange in Dublin."
Translation:Ithim oráiste i mBaile Átha Cliath.
As demonstrated above, each letter is "eclipsed" by a certain letter. Each of the eclipsing letter sounds is a little or a lot more accomplished deeper in the mouth or throat than the letter it eclipses. These are probably not the correct technical terms but I think of them as more guttural or voiced. Some people have made up mnemonic devices to memorize which letter eclipses which but I've been given the advice that using the devices is too slow and straight up memorization is better.
Just to clarify what I'm hearing on http://forvo.com/word/i_mbaile_%C3%A1tha_cliath/#ga , since Baile Átha Cliath is normally pronounced something like 'Blath Cliath', the eclipsis changes that to 'mBlath Cliath', right?