管理根实体 x 的一个持久化闭包被定义为一个管理实体集 C(x) ={e}，其中 e 可以直接或间接通过一个持久化关系从 x 访问。
A persistent closure of a managed root entity x is defined as the set of managed entities C(x) ={e}, where e is reachable from x directly or indirectly via a persistent relationship.
通过控制中心通过AT指令集连接通讯模块，通过继电器控制电机，保证用户能够通过手机远程遥控骆驼机器人。程序包里面有骆驼机器人的源代码和AT指令集。
Control center through the at instruction set through the communication module connected through the electrical relay control to ensure that mobile phone users to remote control robot camel.
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