Since the 20th century following units were widely used by humans:
s ɪ n s WORD_BOUNDARY ð ə WORD_BOUNDARY t w ɛ n t iə θ WORD_BOUNDARY s ɛ n t̠ʃ ə ɹ ɹ i WORD_BOUNDARY f ɑ l oʊ ɪ ŋ WORD_BOUNDARY j uː n ɪ t s WORD_BOUNDARY w ɜː WORD_BOUNDARY w aɪ d l i WORD_BOUNDARY j uː z d WORD_BOUNDARY b aɪ WORD_BOUNDARY h j uː m ə n z WORD_BOUNDARY