By using characteristic of inheritance and encapsulation, code of programmer is more succinct, and speed of running is faster.

利用类的继承和多态特性，程序代码简洁，运行速度快。

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As being one of important characteristic of object-oriented language, Inheritance is often used during system design phase, but the system flexibility will become low if it is used without control.

继承作为面向对象语言的一个重要特性，在系统设计时经常被用到。但继承的滥用会导致系统的灵活性大大下降。

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The characteristic is provided with inheritance unlti_periods and difference, and its main form is interrupted sinking and a series of movement breaking tape is formed.

其特点是具有继承性、多期性和差异性，主要表现形式为间歇性下沉，并形成了一系列活动断裂带。

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