Discretionary access control (DAC) is the kernel of most protection mechanism, and the research on safety of DAC concerns whether rights can be leaked to unauthorized subjects.
自由访问控制(DAC)是大多数操作系统保护机制的核心，DAC的安全性研究关注对象的权限是否被泄漏给未授权主体。
A systematic research had been done on safety of vaccine against carp dropsy, immunological protection and valence, and an oral vaccination was carried out in fishery.
对鲤鱼竖鳞病疫苗的安全性、免疫保护力和免疫效价进行了系统性的研究，并进行了口服免疫养殖应用实验。
Our factory is devoting to research and production, sales a serial of safety and protection goods such as safety mask, safety goggles, safety helmet and so on.
坚持致力于研发，生产，销售以防护面罩，眼镜，安全帽等一系列安全防护用品为主的安全防护行业。
Making use of swimming teaching experience and measures that are proposed in reference, the author makes a preliminary research on the safety protection in swimming class.
利用多年游泳教学经验及文献给出的方法，对高校开设游泳课教学中安全防护作了初步探讨。
Our factory is devoting to research and production, sales a serial of safety and protection goods such as safety mask, safety goggles, safety helmet and so on.
坚持努力于研发，生产，销售以防护面罩，眼镜，安全帽等一系列安全防护用品为主的安全防护行业。
Therefore, the research on collision characteristics of motor vehicles and trailers rear underrun protection for improving the safety performance of automobile collision is of great significance.
因此，研究车辆后下部防护装置的碰撞特性，对于提高汽车碰撞安全性具有重要的意义。
Therefore, the research on collision characteristics of motor vehicles and trailers rear underrun protection for improving the safety performance of automobile collision is of great significance.
因此，研究车辆后下部防护装置的碰撞特性，对于提高汽车碰撞安全性具有重要的意义。
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