If the add operation fails because the element was already in the collection, it releases the permit (because it did not actually use the space it had reserved).
添加操作如果由于该元素已经在连接中了而失败，那么它会释放许可证(因为它不实际使用它所保留的空间)。
New for SQL Server 2008, permit you to add a WHERE clause to an index, thus focusing the index on the most important rows.
这是SQLServer 2008的新特性，它使我们可以向索引增加WHERE子句，这样就可以将索引聚焦到大多数重要的行上。
LeakyBoundedSet first waits for a permit to be available (indicating that there is space in the collection), then tries to add the element to the collection.
LeakyBoundedSet首先等待一个许可证成为可用的(表示连接中有空间了)，然后试图将元素添加到连接中。
Multiple interfaces permit versioning of objects without breaking on-the-wire compatibility: to create a newer version, we add new interfaces to existing objects.
多接口允许对象的版本控制，而不会破坏已上线对象的兼容性：要创建一个新的版本，我们会在现有对象上添加新的接口。
Sometimes it is useful to permit a particular DN to add or remove itself from an attribute.
有时允许特定DN从属性中增加或删除自己是有用的。
To work around this problem, select the following columns of the selected table when you add a data form by using the Data Form Wizard: the primary column and a column that does not permit NULLs.
若要解决此问题，请在添加数据窗体时通过使用“数据窗体向导”选择所选表中的以下列：主列和不允许 NULL 的列。
To work around this problem, select the following columns of the selected table when you add a data form by using the Data Form Wizard: the primary column and a column that does not permit NULLs.
若要解决此问题，请在添加数据窗体时通过使用“数据窗体向导”选择所选表中的以下列：主列和不允许 NULL 的列。
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