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。
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。
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.