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The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil’s acidity.
相信这道题同志们都很熟悉，我想探讨的是对于一些重要语言的概念。
我下面的理解是否正确，请老师们指教：
is not actually defined, 说明油的质量，和酸的含量不是一一对等的关系，后文解释：较少的FOA → 较高质量，[ 这并不意味着逆命题成立，是指从文章的态度可知：逆命题不成立，否则一一对等的关系就成立了]
an accurate measure，说明酸的含量和FOA一一对等。箭头在两个方向都成立 | 
