...上课听讲很认真 » Class attendance is seriously 同源抗体 » Homologous immune body 参加暑期社会实践、金工实习、生产实习 » To attend a summer social practice, metalworking, production practice ..
Only the immunesystemdevelops the homologousfunctionandkeepstheoppositebalance under the conditionofnormal, the machine bodythen canmaintain the existence.