使用动态强制类型转换要小心。只要有可能，定义和使用虚函数比直接接管类型管理好得多。
Dynamic casts should be used with caution. Whenever possible, it is much better to define and use a virtual function rather than to take over managing the types directly.
新颖、安全的动态身份认证系统主要由电子令牌、安全认证服务器、管理工作站、认证服务接口函数等组成。
Novel and secure dynamic identification system comprises electrical tokens, a secure identification server, a management workstation and application Programming Interface.
新颖、安全的动态身份认证系统主要由电子令牌、安全认证服务器、管理工作站、认证服务接口函数等组成。
Novel and secure dynamic identification system comprises electrical tokens, a secure identification server, a management workstation and application Programming Interface.
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