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。
2. They asked their experimenter to hang up the phone. 他们要求实验人员挂断电话。
3. She was an inveterate experimenter in these things. 在这些东西上，她总是要都拿来试一试。
4. To train a rat, the experimenter placed it in an operant conditioning chamber: a small plastic box with a lever at one end. 为了训练小鼠，实验人员把它放在一个操作性条件反射室：一个一端置有操作杆的塑料箱。
5. Another experimenter, Hamner, however, discovered that hamsters from California maintain their original rhythms even at the South Pole. 然而，另一名实验人员哈姆纳发现，即使在南极，来自加利福尼亚的仓鼠也能保持它们原来的节奏。
