noun · the attraction or tendency of a chemical species to react or bond with another

这种抗体对目标抗原具有极高的亲和力。

noun · the quality of being easy to talk to or friendly in a personal or social context

他平易近人，很有亲和力，大家都愿意和他交流。

noun · the accessibility or ease of use of a product or interface design

这款软件的界面设计非常有亲和力，深受用户好评。