Study of Gary Snyder's eco-ethic thoughts A study of Gary Snyder's eco-ethic thoughts Study on Zhang Xunhua's economic thoughts A study of Gary Snyder's eco-ethic thoughts：佛山科学技术学院科学研究著作资助出版 Study of Marx's democratic thought Study on Chen Zheng's economic thoughts Study on Song Tao's economic thoughts Study on Shen Deqian's poetic thoughts Study on Wei Xinghua's economic thoughts Study on Wu Xuangong's economic thoughts