操作类继承的抽象类也已被创建以保存所有的操作类实现所需的共同代码。
An abstract class that our Action classes extend has also been created, to hold common code needed for all our Action class implementations.
有兄弟二人继承了一块土地，他们每人承担着一半的耕种。兄弟俩感情很深。什么都共同享用。
Two brothers had a piece of land for their inheritance, of which each cultivated the half. They were united by deep feeling, and had everything in common.
源远流长的历史使中国继承了一份十分宝贵的世界文化和自然遗产，它们是人类的共同瑰宝。
History of long standing and well established makes China inherit a most valuable world culture and natural legacy, they are human common rarities.
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