It isn't. The letter 't' is never pronounced like an 'r'.
Sometimes, when a 't' is between two vowels, it can sound close to a 'd' sound. This is a particular feature of US and Canadian English, but it also occurs in other varieties of English.
28 de agosto de 2014
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I agree with Danielle. If you think R and T are similar in English, then you're definitely pronouncing one of those sounds wrong.
It's not a good idea to substitute sounds from another language either. It just creates a habit of mispronouncing words. You're far better off learning the proper sounds in English.
28 de agosto de 2014
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Never
28 de agosto de 2014
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