• 1. knob down: 按下按钮
• 2. volume down knob: 音量降低纽
• 3. down slope regulating knob: 下斜坡调节旋钮 | 倒坡调节旋钮

• 1.The experimenter is back there with the speed knob and at random intervals, he just speeds up the tape of their heart and then slows it down.
  实验者带着速度旋钮回到那里，在随机的时间间隔里，他只是给他们的心跳录音带加速，然后再减速。
  dict.yoduao.com
• 2.Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
  四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
  dict.yoduao.com
• 3.And the experimenter is back there with the speed knob and at random intervals he just speeds up the tape of their heart and then slows it down.
  实验者回到实验室，带着录音设备，随机地，他加速了心跳的录音，然后又慢下来。
  dict.yoduao.com

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