The spelling of the word "sausage balloon" can be explained using IPA phonetic transcription. The word starts with the consonant cluster /s/+/ɔː/, represented by the "s" and "au" letters. Then, the vowel cluster /dʒ/+/ɪn/, represented by the "sausage" letters, is followed by the consonant cluster /b/+/əlun/, represented by the "b" and "alloon" letters. The final sound of the word is /n/, represented by the letter "n." This complex spelling might cause some difficulties for non-native speakers trying to pronounce the word correctly.