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)。

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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SQL Server 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。

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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。

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Left unchecked, the debt-for-equity movement will add but eliminate taxes on industries that have stable enough cash flows to permit recapitalizations.

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