Female ginkgoes produce the troublesome seeds, which are covered in a fleshy coating that contains butyric acid, also found in rancid butter.

雌性的银杏树会结果实，造成困扰；果实外壳厚实，含有丁酸，这种成分也会出现在酸腐的牛油中。

youdao

To fry vegetable with high amount of undesaturated fatty acid . (pea-nut oil, olive oil and vegetable oil); to avoid using oil that contains much saturated fatty acid (pig oil, cow oil and butter)

炒菜移用单元不饱和酯肪酸高者（花生油、橄榄油、菜籽油）；少用饱和酯纺酸含量高者（猪油、牛油、奶油等）。

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The good fat in "good" chocolate is cocoa butter, which is a source of heart-healthy stearic acid.

硬脂酸有益心脏，而优质巧克力含有的优质脂肪是可可脂，正是硬脂酸的重要来源。

youdao

The result, though more mild than the original preparation, has enough acid to cut through the fatty butter.

WSJ: Ham and Pickled Ramp Tartines | Slow Food Fast

They're readying black wooden fume boards--hive lids lined in absorbent black felt on which they will drizzle butyric acid, the active ingredient in rancid butter.

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