安全一度是群居生活的重要动机。而如今大都市毒祸横流，安定的生活相比城郊更使人难以捉摸。
Security, once one of the main reasons for huddling together, is often now more elusive in the druggy streets of the metropolis than in the exurbs.
用与制造菌苗株一致的培养物制备检测抗原，检测30日龄雏鸡免疫后抗体效价，对不同抗体滴度的雏鸡进行了攻毒保护性试验。
In the experiment we used the antigen to detect the valence of antibody of 30 days immuned chicken, which is the same antigen with the strains of chicken e.
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