It's analogous to the use of antibiotics and pesticides in conventional farming. "Li has taken up the Japanese call for" medicine to learn from farming, and farming to take its power from nature. "Wanting to become an" agricultural doctor, "he is learning from natural farming to gain a true understanding of preventive medicine.
黎旭瀛希望實行日本倡導的「醫學應向農業學習，農業應效法大自然」，期許自己成為一個「農醫」，從自然農法學習真正的預防醫學。