countermeasure and investigatation of the protection and administration of zoology of speriodic solutions to differential systems with unbounded or periodic nonlinearitiesperiodic solutions to differentia
无界或周期非线性微分系统周期解的生态保护与管理对策与研究
以上为机器翻译结果，长、整句建议使用 人工翻译 。