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phototropy [fəuˈtɔtrəpi] n
gen. 光致色互变现象; 光电互变现象; 光色随人射光波长的变化
chem. 光致变色
oil 光色互变
tech. 光致变色现象; 光色随入射波长的变化; 光色互变 (现象)

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