Different units are used for different applications.
d ɪ f ɹ ə n t WORD_BOUNDARY j uː n ɪ t s WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY j uː z d WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY d ɪ f ɹ ə n t WORD_BOUNDARY æ p l ɪ k eɪ ʃ ə n z WORD_BOUNDARY