反馈； 回授,自旋挠痒法
Stop tickling me, you beast! 别胳肢我了，你这讨厌鬼！
Tomato plants need tickling to initiate pollination.In recent years British growers have been using bumblebees to do this. 西红柿授粉要用回授技术，英国人近年来是用大黄蜂完成授粉。
