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erubescent adj.發紅的,略帶紅色的;變紅的;臉紅的。

eruct

Connect 2 oxidation sulfur shi rui to try juice , if do not heat , after is litmus erubescent whether change by oneself a primary colors 將二氧化硫通入石蕊試液,若不加熱,石蕊變紅后能否自行變回原色