Chinese · Pronunciation Guide
sheen, held high and flat, with the thin x hiss and a front n. A true homophone of 新 xīn, "new".
xīn
Level and immovable. Its identity with 新 xīn is complete — same initial, same final, same tone — so nothing in the sound distinguishes heart from new, and only context does. That is a useful corrective to the assumption that tones eliminate ambiguity in Mandarin.
Listen: 心
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我的心跳得很快。
Wǒ de xīn tiào de hěn kuài.
My heart is beating fast.
Listen: 我的心跳得很快。
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我的心跳得很快。 keeps hěn at a full dip before the falling kuài. Wǒ also keeps its dip because de is toneless. So there are two unchanged dipping tones, and in between, xīn holds level, tiào plunges, de fades. The sentence has three separate weightless or low moments, which is what gives it its uneven rhythm.
The x becomes an English "sh" for most learners, which pushes it toward shēn — a real word meaning body. Spread the lips and keep the tip down. The nasal is the other issue: xīng with a back nasal is extremely common, so the merger creates genuine ambiguity rather than mere accent.