Contradictory relationship means that there is only one * * * intersection between two things, and apart from this * * * intersection, these two things have no overlap or similarity in other aspects. For example, "man" and "woman" are contradictory, because they only have the same things as "man", and besides, men and women have no overlap or similarity in other aspects.

Opposition means that there is no intersection between two concepts and their scope does not overlap. For example, "bird" and "fish" are opposites, because birds live in air and fish live in water, and their living environments are completely different and there is no intersection.

Although animal oil and vegetable oil come from different sources, they are both composed of glycerol and fatty acids, and have certain similarities in chemical composition. Therefore, animal oil and vegetable oil are neither contradictory nor antagonistic, and there is a certain correlation between them.