英语翻译frequently the identity of the two fibres can be determi
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）.
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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