另外，您可以对某个策略执行三种操作，即预览、下载、下载和清除。
In addition, there are three types of actions you can perform on a policy. These include preview, download, and download and clean.
如果操作员手工清除最后一次执行记录，那么该版本就会消失。
If the operator manually purges the record about the last execution, the edition disappears.
为了确保最高的安全性，应该在操作的用户凭证变化之前或在用户注销时执行清除。
To maximize security, this should be done before every operation that involves a change in credentials, as well as when the user logs out.
应用程序可用其执行日志传送配置中的备份、复制和还原操作以及相关的清除任务，而无需运行备份、复制和还原作业。
Used by applications to perform backup, copy, and restore operations and associated clean-up tasks for a log shipping configuration without running the backup, copy, and restore jobs.
同样，它还能用于执行pre -mortem清除操作。
As such, it can be used to perform pre-mortem cleanup operations.
可以对选定内容执行标准的编辑操作，包括剪切、复制、清除和移动，而不管选定内容是整个图像还是仅是图像的一部分。
You can perform standard editing operations — cutting, copying, clearing, and moving — on a selection, whether the selection is the entire image or just a part of it.
此方法的默认实现需要由派生类重写，以便在清除集合之后执行某些操作。
The default implementation of this method is intended to be overridden by a derived class to perform some action after the collection is cleared.
此方法的默认实现需要由派生类重写，以便在清除集合之前执行某些操作。
The default implementation of this method is intended to be overridden by a derived class to perform some action before the collection is cleared.
此方法的默认实现需要由派生类重写，以便在清除集合之前执行某些操作。
The default implementation of this method is intended to be overridden by a derived class to perform some action before the collection is cleared.
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