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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Australian – For this word:  the “Au” combination is pronounced like the “Aw” combination;  the “t” is pronounced like the “ch” combination (this is due to the placement of the letter “r” directly after it);  the second “a” is short;  and for the “-ian” suffix – the “i” is pronounced like the long letter “e”;  and the “a” is pronounced as an i-schwa (this is the standard pronunciation of this suffix in The Common Tongue).

– /aws-CHRæ-lee-ihn-z/ – /ɔs.tʃɹæ.liː.ə(ɪ)n.z/ – Notice also that the stress is on the second syllable and that the “z” ending acts as a separate syllable –

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Learn More About The Word “Australian” On Wiktionary

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