Once again , the rats were placed on the treadmill , in the harness , and their spinal cords were tickled by the stimulator .
老鼠再一次带着挽具被放在跑步机上,脊髓被刺激器搔着痒痒。
The lion was so tickled at the idea of the mouse being able to help him that he lifted up his paw and let him go .
狮子被老鼠可能会帮他的想法逗乐了,他抬起爪子,放了它。
As far back as charles darwin , scientists have noted that apes make characteristic sounds during play or while being tickled , apparently to signal that they 're interested in playing .