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The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:Log in to the system in Safe Mode, The desktop you see is very different from what you usually see. Just like the mode on a Windows 98 system when the system is just installed and no drivers are installed, This is the case, When Windows is running in safe mode, The system will only load the most basic services and drivers that can start the system, so the operating system will run with the least number of drivers and services, and use a common graphics card driver to work at a resolution of 640 × 480. At the same time, it can only support keyboard, mouse, display, local hard disk and turn on the default system services. In safe mode, Windows does not load drivers for audio devices and other unnecessary peripherals, and Windows ignores all programs that run automatically with the system startup.趁着几位大人和大家都在这，做个见证。可眼前，战事依然是头等要事吧？我看还真不是头等。青石沟中，一队五百人的秦兵正往前推进。晨晓(曲泉丞饰）大学毕业，在父亲的安排之下，到石屏县大山村小学支教，准备一年后回大学免试读研究生。姚春秀（王祎饰）为了实现自己的理想，成为大山村的大学生村官，最终实现做公务员的理想。水泉（杨紫茳饰）是大山村第二代农民工，想通过打工学手艺立足，最终实现成为城里人的愿望。 　　 晨晓到了大山村小学后，发挥自己的专长，成长为一名优秀的山村教师，雨季来临，晨晓为了保护学生，献出了自己年轻的生命。姚春秀当上村官之后，逐渐对大山村产生了深厚的感情，当晨晓不幸罹难后，她放弃了做公务员的机会，决心坚守在大山村，永远“陪伴”着晨晓。