欸乃

欸乃	ǎi nǎi	(onom.) (literary) the creaking of a stern-mounted oar
欸	āi	(indicating response) / (sadly sighing) / also pr. [ei4]
欸	ǎi	(Tw) (literary) to rebuke loudly / (Tw) (literary) to sigh / used in 欸乃
欸	ēi	hey (used to draw attention)
欸	éi	eh; huh (used to express surprise)
欸	ěi	hmm (used to express disapproval)
欸	èi	yes (used to express agreement)
乃	nǎi	to be / thus / so / therefore / then / only / thereupon
乃	nǎi	variant of 乃