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科学家们经过两百多年的研究,才对这个过程有了比较清楚的认识,他们一步一步揭开光合作用之谜。在发现光合作用之前,人们认为使植物增重的是土壤,因为植物生长在土壤里。
After more than two hundred years of research, scientists have got a clearer understanding of the process. They step by step to uncover the mystery of photosynthesis. Before the discovery of photosynthesis, it is thought that the plant is gaining weight because the plant grows in the soil.