2 sentences

1. 人体免疫系统能识别入侵的抗原。

   rén​tǐ miǎn​yì xì​tǒng néng shí​bié rù​qīn de kàng​yuán.

   The human immune system can identify invading antigens.

   Source: Dong Chinese Dictionary

2. 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