求翻译：酸度系数在1.8和2.0之间时，耐碱性能达到最好；酸度系数递继续增到2.4时，耐水、耐酸性能略有提高，耐碱性能略有下降。是什么意思？

The acidity coefficient between 1.8 and 2.0, the alkali resistance of the best; acidity coefficient delivery continue to increase to 2.4, water resistance, acid resistance increased slightly, a slight decline in alkali resistance.

In acidity factor between 1.8 and 2.0 is best, and alkalis to reach transmitting; acidity factor is to continue to increase to 2.4 and water-resistant, acid resistant performance slightly, alkalis to slightly lower.

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When the acidity coefficient of between 1.8 and 2, alkali-resistant performance to achieve the best; the acidity coefficient when the pass continued to increase to 2.4, slightly increased resistance to water, acid, alkali resistance have decreased slightly.

Coefficient of acidity when 1.8 and 2.0, the kali resistivity can achieve well; The coefficient of acidity hands over when continues to increase to 2.4, water resistant, the acidproof performance slightly has the enhancement, the kali resistivity can slightly have the drop.