Chinese · Pronunciation Guide
arr-dz: a rising first syllable that is an r-coloured vowel, then a weak toneless second with no real vowel at all.
érzi
One toned syllable and one without. This is one of very few Mandarin syllables where r-colouring is genuinely part of the vowel rather than a suffix, and it carries a full rising tone here. Contrast the r in 一点儿, where the colouring is an added suffix that deletes a nasal and carries no tone of its own.
Listen: 儿子
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他有一个小儿子。
Tā yǒu yí ge xiǎo érzi.
He has a young son.
Listen: 他有一个小儿子。
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他有一个小儿子。 contains the 一 conversion: yí before the underlyingly-falling ge. Then xiǎo keeps its full dip because ér rises, not dips. Earlier, tā holds high and yǒu dips. So the sentence has two unchanged dipping tones and one converted 一, and the conversion is the only thing that has moved.
That second syllable comes out as "zee" or "zuh" for most learners — both import vowels that are not there. Keep the tongue at the teeth and let it buzz. On the first syllable, learners either suppress the r-colouring entirely, having been warned off English r, or make it a full English "er" with a level pitch. It needs both the colouring and the climb.