Chinese · Pronunciation Guide
doong-shi: a high level first syllable, then a weak toneless second. Note that with a full first tone on the second syllable it means "east and west" instead.
dōngxi
This is one of the clearest cases where neutralisation carries meaning. Spoken dōngxi with a toneless second syllable it means "thing"; spoken dōngxī with a full level tone it means the compass directions east and west. The tone is not decorative — it is the difference between two words.
Listen: 东西
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你想喝点东西吗?
Nǐ xiǎng hē diǎn dōngxi ma?
Do you want something to drink?
Listen: 你想喝点东西吗?
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你想喝点东西吗? opens with nǐ and xiǎng adjacent, both dipping, so nǐ rises. Then hē holds high, diǎn dips, dōng holds high, xi fades, and ma fades too. Two toneless syllables at the end mean the question simply expires rather than resolving, and there is no interrogative rise anywhere.
Restoring the tone on xi is the specific error to avoid, since it produces a different word. Let it go slack. Beyond that, the x becomes an English "sh" for most learners, and the -ong vowel opens out to an English "ong" when the lips should stay tightly pursed. And the nǐ xiǎng conversion at the start is the usual casualty.