3 sentences

1. 这种抗体对目标抗原具有极高的亲和力。

   zhè zhǒng kàng​tǐ duì mù​biāo kàng​yuán jù​yǒu jí gāo de qīn​hé​lì.

   This antibody has a very high affinity for the target antigen.

   Source: Dong Chinese Dictionary

2. 他平易近人，很有亲和力，大家都愿意和他交流。

   tā píng​yì​jìn​rén, hěn yǒu qīn​hé​lì, dà​jiā dōu yuàn​yì hé tā jiāo​liú.

   He is approachable and very personable; everyone is happy to talk with him.

   Source: Dong Chinese Dictionary

3. 这款软件的界面设计非常有亲和力，深受用户好评。

   zhè kuǎn ruǎn​jiàn de jiè​miàn shè​jì fēi​cháng yǒu qīn​hé​lì, shēn shòu yòng​hù hǎo​píng.

   The interface design of this software is very user-friendly and has been well-received by users.

   Source: Dong Chinese Dictionary