此方法的默认实现的运算复杂度为O (1)。
The default implementation of this method is an o (1) operation.
使用默认压缩设置来实现备份运作和备份大小的最佳融合。
Use the default compression setting for the best combination of backup performance and backup size.
像代码5这样，我可以仅仅向抽象类中添加一些默认的实现。
I could just add default implementations to the abstract class as shown in Figure 5.
像代码5这样，我可以仅仅向抽象类中添加一些默认的实现。
I could just add default implementations to the abstract class as shown in Figure 5.
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