sigh /sɑi/ I. n.  ［c］ 叹息(声)： breathe a sigh of relief 宽慰地舒口气；give/utter a deep (little) sigh 重重(轻轻)地叹了口气 ‖II. vi. 叹息，叹气：sigh with tiredness/weariness发出一声疲倦的叹息；sigh about/over one’s failure 为失败而叹息