以下为句子列表：
英文: Abstract: Three theory problems about technology of leather making are discussed.The first is the difference between surface charge and isoelectric point (PI).The second is about the origin of the calculation formula of basicity in making Cr3+ liquor.The
中文: 文摘:本文讨论了皮革制造中的三个理论问题，一是表面电荷与电点(PI)之间差别，二是三价铬鞣液配制中公式的简单来源，三是生皮在碱液中膨胀的机理。
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英文: The extent of the regions was determined by the descriptor basicity.
中文: 这三个数据区的范围大小是由算符的碱性度决定的。
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