detections检测detectionn.探测；侦查；察觉；发觉detection techniques检测技术detection of defects探伤,缺陷检查detection efficiency探测效率,检波效率detection of neutron[电] 检波器中子侦检detection confidence探查可信度detection of acetate醋酸根检验detection unit sound伴音检波器detection statistics检测统计量detection error cost错误检测开销detection evaluation检测评估

1. He popped his head around the door and said hello.
   他从门后探一探头，打了声招呼。
2. I saw a cardboard box with the head of a puppy sticking out.
   才看到有只小狗从某个纸箱里探头出来。