在抗体发育的最后阶段，抗体生成B细胞识别病原体的特定部分，然后变异或者成熟，所以抗体可以结合病原体更加牢固。

In the final stage of antibody development, antibody-producing B cells recognize specific parts of a pathogen and then mutate, or mature, so the antibody can bind to the pathogen more firmly.

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中国是否需要设立专门的反家庭暴力法？立法者已经进入了最后的立项论证阶段，评估立法的社会和法律环境是否成熟。

Lawmakers are entering their last stage of assessing China's need for a law against domestic violence and if the country's social and legal environments are ready for one.

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