methyl orange
noun [ U ] chemistry specialized uk/ˌmeθ.əl ˈɒr.ɪndʒ/ us/ˌmeθ.əl ˈɔːr.ɪndʒ/
甲基橙(用于显示含酸量的物质)
a substance used by scientists to show the amount of acid in a substance
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