酚类物质是重要的植物次生代谢物质之一。
Phenols are one of the important secondary metabolism products of plants.
牛蒡自身含多种次生代谢物质，病虫害很少侵染，是较好的药食同源植物。
Burdock contains many bioactive substances and secondary metabolites, it hardly infected with pathogen.
次生代谢物质含量随紫外线和光强度而变化，从而保护植物免受强辐射的伤害。
The secondary metabolites contents changed with the intensity of ultraviolet radiation and light, which protected the plants from strong radiation.
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