Dactylic is the adjective from 'dactyl'. It describes poetry built on the STRONG-weak-weak beat: one hard syllable followed by two soft ones, as in CARE-ful-ly. If a poem keeps repeating that pattern, we say it is written in dactylic rhythm, or dactylic metre. The phrase you will meet most often is 'dactylic hexameter' — six dactyls to a line — which is the shape of the great old Greek and Latin poems, the Iliad and the Odyssey and the Aeneid. The word can also work as a noun for a line or verse in that rhythm, though that use is rare and quite bookish. Like 'dactyl', this belongs to literature class; nobody says it at dinner. In writing about Greek and Latin, 'dactylic' means one long syllable plus two short ones, because those poets measured how long a syllable took to say, not how hard it was hit.

揚抑抑格的（形容詩的節奏；常見詞組 dactylic hexameter＝揚抑抑格六音步）