Looking at his "worries about society" in his boyhood and his "worries about life" in his youth as well as his "worries about society" again in his old age, as well as his academic shift and value transformation in these three stages, we can see that his death is not just a motivation for "love", but for "culture", that is his own views on value and political convictions.

Influence discussion of the ecological thought to the modern landscape design;

Analysis on Marx and Engels Dialectical Materialism s Ecological Thought;