许多民歌有 “ 重复句 ”, 即每一段都有规则地重复出现的单独句.Many folk songs have " refrains ", that is, regularly repeated independent elements attached to each stanza.在重图中允许有重边和重自环, 自环是一种特殊的边.In a multigraph both multiple edges and multiple loops...
walking across open moorland穿越开阔的高沼地Many a morning on the moorland did we hear the copses ring.许多个清晨我们听到高沼地里灌木的低吟.Hey ploughed nearly 100,000 acres of virgin moorland.他们犁了将近10万英亩未开垦的高沼地。...rugged Yorkshire moorland.约克郡多岩...