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中医理论认为中药的疗效来自中药的基本性能—其性味、功效、趋向（升、降、浮、沉）及归经。随着现代科学技术的发展，不断揭示了中药的气味是有物质基础的，它包括两大体系：一是活性分子，二是微量元素。近年来，对中药中微量元素已作了一些研究，并揭示了微量元素在中药功
Chinese medicine theory believes that the efficacy of Chinese medicine comes from the basic properties of traditional Chinese medicine - its taste, efficacy, tendency (up, down, float, sink) and return. With the development of modern science and technology, it has been revealed that the odor of traditional Chinese medicine has a material basis. It includes two major systems: one is an active molecule and the other is a trace element. In recent years, some studies have been done on trace elements in traditional Chinese medicine and trace elements have been discovered in traditional Chinese medicine.