yo.del HjEJ7d[l, $5joJ- v [I] -ll- or Am usually -l- to sing by making a series of very fast changes between the natural voice and a much higher voice 用真假嗓音迅速变换地唱，变声唱 Yodelling is associated with folk songs of the Swiss Alps. 瑞士阿尔卑斯山的民歌常常使用真假嗓音迅速变换的唱腔。