... stibonium salt 四氢锑盐 stick lac 师虫胶 stick sulphur 棒状硫磺 ...
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The fact that copper pollution of laccaic acid in stick lac could not be avoided was concluded after considering its biological source and chemical nature.
从紫胶的生物来源和紫胶红色素的化学本质分析，紫胶原胶中紫胶红色素的铜污染是不可避免的。
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The resin hardens into a protective shell, which is known as stick lac.
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The shell, stick and bug are broken up and separated so that only the lac remains.
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