Chinese · Pronunciation Guide
DAH-dyen-HWAH: a low dipping first syllable followed by two hard falls. The middle syllable is closer to "dyen" than "dee-an".
dǎ diànhuà
A dip followed by two falls, with no sandhi anywhere. The rhythm point is that consecutive fourth tones are never identical: diàn is compressed and does not descend all the way, while huà gets the fuller drop at the end of the phrase. Making them the same length produces a hammered, unnatural rhythm.
Listen: 打电话
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我待会儿给你打电话。
Wǒ dāihuìr gěi nǐ dǎ diànhuà.
I'll call you later.
Listen: 我待会儿给你打电话。
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我待会儿给你打电话。 hides a three-way sandhi in the middle. Gěi, nǐ and dǎ are three consecutive third tones, and Mandarin raises all but the last: géi ní dǎ. So two syllables written with dipping hooks come out as rises. This is one of the more demanding sequences a beginner will meet, and it is completely routine for a native speaker.
The -ian final draws the standard error, with learners saying "dee-AHN" in two beats and an open vowel. It is one beat and the vowel is a tight "eh". Beyond that, the three-third-tone run in the example sentence is where most people give up and produce three dips, which is slow, effortful and unmistakably foreign. Practise géi ní dǎ as a fixed unit.