The following video demonstrates each syllable of the pinyin structure
and the exercise of pinyin/zhuyin with basic Chinese 4-tune pronunciation

Mandarin pinyin tunes
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to link more related multi-character Chinese words!

nuān, nuán, nuǎn, nuàn

third tune

nuǎn

warm; genial nice and warm 暖 nuǎn

warm; warmth 溫暖 wēn nuǎn
lukewarm; gentle 溫 wēn	warm; genial 暖 nuǎn