31.  While the window hanging the dirty curtain had been opened slowly, the dancing dust in the air could be seen clear.

32.  Comparatively, girls studying science look very much like students from high schools and nearly all their attention have been paid to study.

33.  "Actually, " he added, "I have some friends who study science and are also cute and adorable, but the kind of stereotype has been rooted in my heart.

34.  In fact, men and women have always been taking different responsibilities since people existed in this world.

35.  Women begin to employ themselves in some jobs which have been considered as men's work.

36.  There has been long-lasting controversies on what roles men and women should take in life.

37.  In the past five decades, more and more sociologists and feminists have emphasized that a lot of work which has been supposed to be a men's work is also suited for women.

38.  The current roles of men and women have been recognized for so many years.

39.  Role of men and women in life has always been a hot topic throughout human history, perhaps since Adam and Eve.

40.  Besides, the strong men have been given not to dominate but rather to serve and protect.