The spelling of the word "BETAEPLI" can be explained phonetically using the International Phonetic Alphabet (IPA). The first syllable "BE" is pronounced /bi/ with a short "i" sound, followed by "TAE" pronounced /teɪ/ with a long "eɪ" sound. The final syllable "PLI" is pronounced /pli/, with a short "i" sound again. Therefore, the phonetic transcription of the word "BETAEPLI" is /bi.teɪ.pli/. It is important to use phonetics to ensure the correct pronunciation of words.