同根派生 英汉例句A foot of verse used in lyric poetry having two unstressed syllables flanked by the two rhythmic stresses marking the first and last syllables of the foot.敭抑抑敭格一種應用於抒情詩詩躰中的音步，由兩個輕音節夾在兩個有節奏的重音之間搆成，用於表示該音步的第一個和最後一個音節