一“五四”时期，针对封建保守势力压制新生力量，以“老”自傲而歧视“黄口小儿”的旧意识，鲁迅大力宣传了进化论的生死观，指出新陈代谢的规律不可抗拒而应正确对待：“进化的途中总须新陈代谢。所以新的应欢天喜地的向前走去，这便是壮，旧的也应该欢天喜地的向前走去，这? In the period of the May 4th Movement, in response to feudal conservative forces suppressing the new forces and “old” pride discriminating against the old consciousness of “Huangkou children”, Lu Xun vigorously publicized the theory of evolution and pointed out that the law of metabolism should be treated irresistible and should be treated correctly : "The evolution of the way must always be metabolic, so the new should walk happily forward, this is the strong, the old should also be happily walking forward, which?