基本解释[军事学]枪栓固定卡榫英汉例句双语例句I also find the device hard to hold when its slid open - the top edges of the keyboard area are sharp and dig into my hands and fingers.我还发现这手机划开时很难手持-键盘上缘锋利得像要切入我的手掌手指。hold-open device更多例句词组短语短语door hold -open device 保持门开启装置hold-open device更多词组专业释义军事学枪栓固定卡榫