A yellowish, white, or reddish-gray crystalline powder, NH2C6H4C6H4NH2, used in dyes and to detect blood stains.是什么意思_A yellowish, white, or reddish-gray crystalline powder, NH2C6H4C6H4NH2, used in dyes and to detect blood stains.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句