2. Beauty is a developing cultural knowledge, which fully embodies people's subjective initiative in understanding beauty.
3. Beauty is a developing cultural knowledge, and it is also the fundamental difference between people and animals in understanding beauty.
4. The characteristics of beauty inferred from the knowledge that beauty is a developing culture are consistent with human understanding of beauty.
From the understanding that beauty is a developing culture, we can see the inevitability of the unity of truth, goodness and beauty.