The same to man brain and body, continued long time on a same work let the same place of pallium or muscle be strain and tired and this pull down their activities.

• 人的脑力和体力也是这样，如果长时间持续同一项工作内容，大脑皮层的某个部位长期得不到休息，或是肌体的某个部位长期紧张，就会产生疲劳，使活动能力下降。