Taking the door ring in his hand, he gave two gentle knocks, then four more after a pause, and finally three more.
来福儿上前执着门环，轻击两下，停了一停，再击四下，然后又击三下。
In the rational class, then, four operations have been defined for rational Numbers.
在rational类中，为有理数定义了4种操作。
In the rational class, then, four operations have been defined for rational Numbers.
在rational类中，为有理数定义了4种操作。
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