Chinese · Pronunciation Guide
yee-DYAR: the 一 has become a falling tone, and the second syllable ends with an r-colouring that swallows the n.
yìdiǎnr
Two things are happening at once. First, 一 converts to a falling tone because diǎn dips — the same branch of the rule as in 一起. Second, the r-suffix, characteristic of northern Mandarin, attaches to the end and deletes the front nasal. The tone of the syllable survives the suffixation unchanged; only the segments are affected.
Listen: 一点儿
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我会说一点儿中文。
Wǒ huì shuō yìdiǎnr Zhōngwén.
I can speak a little Chinese.
Listen: 我会说一点儿中文。
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我会说一点儿中文。 keeps wǒ at a full dip because huì falls. Then shuō holds high, yì falls, diǎnr dips, and Zhōngwén gives a level and a rise. The r-coloured syllable in the middle is the only place in this sentence where the tongue curls for a vowel rather than a consonant, which makes it stand out audibly.
Learners pronounce the r as a separate syllable — "dyan-er" — when it should fuse into the vowel and eliminate the n entirely. There is no second beat. The other error is the 一: said as a flat yī, it ignores the conversion that a native applies without thinking. And in southern varieties the r-suffix is often dropped altogether, so both forms are worth recognising.