老年人相信一切,中年人怀疑一切,年轻人知道一切。
The old believe everything, the middle-aged suspect everything, the young know everything.
The method of psychology must be strictly controlled.
艺术的任务是使不可见的东西变得可见。
乳制品行业有责任在环境管理方面发挥领导作用。