Chinese · Pronunciation Guide
dzwor-byen: a low sagging first syllable with a "ds" onset, then a weak toneless second closer to "byen" than "bee-an".
zuǒbian
The suffix has gone neutral, which has a structural payoff: because bian carries no tone, zuǒ is never adjacent to a following third tone and so keeps its full dip in phrases where a bare zuǒ would have converted. Location words built this way are tonally more stable than their bare roots.
Listen: 左边
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洗手间在左边。
Xǐshǒujiān zài zuǒbian.
The restroom is on the left.
Listen: 洗手间在左边。
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洗手间在左边。 opens with a three-syllable sandhi problem: xǐ and shǒu are adjacent third tones, so xǐ rises, giving xí shǒu jiān. Then zài falls and zuǒ keeps its dip before the toneless bian. Two of the sentence's three third tones behave differently, and neither behaviour is marked in the pinyin.
Restoring a full tone to bian is the standard error, producing zuǒ biān with two heavy beats — it should be a light suffix. The -ian final also opens out to "byahn" for most learners when it should be a tight "eh". And the z is read as an English z, losing the stop closure that gives the syllable its crispness.