"Smile" not only provides us with pleasure but also expresses different feelings.
“笑”的主体信息是欢乐 ,但又能表达各式各样的感情。
In "Manuscript", Marx analysed the feeling by human nature-a joyous sense from pleasure and interest, happiness and comfort, and to the contrary a sorrowful sense from misfortune, uneasiness and discomfrot, from different psychological states caused by the differences of free labor and dissimilated labor in the social practice.