The problem with the polyunsaturated fatty acids in vegetable oils is that because of their structure, they are unstable.
菜油中包含的多元不饱和脂肪酸，化学结构极不稳定。
环境与科学
It has more protein and about the same proportion of polyunsaturated fatty acids.
它含有更多的蛋白质和大致相同比例的多不饱和脂肪酸。
英语百科
Polyunsaturated fatty acid
Polyunsaturated fatty acids (PUFAs) are fatty acids that contain more than one double bond in their backbone. This class includes many important compounds, such as essential fatty acids and those that give drying oils their characteristic property.
Polyunsaturated fatty acids can be classified in various groups by their chemical structure: