英语翻译frequently the identity of the two fibres can be determined by the speed of solubility in NaOH （两种纤维指蚕丝和羊毛）.

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• 英语翻译frequently the identity of the two fibres can be determined by the speed of solubility in NaOH （两种纤维指蚕丝和羊毛）.
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