求翻译：小调的曲调以徵调式为主，但也有其它调式，如《纪念烈士歌》为羽调式，《黄烟洞大胜利》为商调式。调式音阶多为六声、七声音阶。歌曲的旋律大部分比较简短，音节一般只有10个左右。易学易唱，可自行填改唱词。它的曲式结构与山歌比较起来要匀称一些，常见的有两乐句和四乐句的结构，也有运用乐句的反复来造成乐段的扩充。例如《黄烟洞大胜利》中就是对后两句进行反复而造成乐段的扩充是什么意思？

Minor tunes to requisition type, but there are other tuning, such as "to commemorate the martyrs song" Yu tuning, the type of yellow smoke hole big victory "for the business transfer. The tuning scale for more than six sound, seven-tone scales. Most of the melody short syllables generally only about

The Minor Chords To adjustable-dominated, but there are also other types, such as the commemoration of martyrs for their feathers, the yellow smoke hole victory for the business of adjustable. Adjustable singing for more than 6 tones, 7 sound band. Most of the melodies, short syllables in general th

Minor melodies to levy the melody, but there are also other mood, such as the commemoration of the martyrs feather melody on the song, the yellow fume hole victory for debugging. Adjustable scale band for six, seven sounds. Melody of songs most of the brief, syllables normally only 10 or so. Easy to