The spelling of the word "KAIXAI" can be explained through its pronunciation using IPA phonetic transcription. The first syllable "KA" is pronounced as /keɪ/, with stress on the first vowel sound. The next syllable "IX" is pronounced as /ɪks/, with emphasis on the second sound. The final syllable "AI" has a long vowel sound, pronounced as /aɪ/. Therefore, the correct spelling of the word "KAIXAI" is crucial to accurately pronounce and understand its meaning.