"luó" is the first syllable, pronounced as [luó]; "b" is the second syllable, pronounced [b]. Syllable is the basic phonetic unit in language, which refers to the continuous sound that can be heard during pronunciation. Consists of one or more consonants and a vowel, or contains only vowels (called open-close binary) or only consonants (called closed binary). Each word can be divided into several different syllables.