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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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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Procedures for the issuance and collection of work permit are detailed overleaf.

发放和收集工作许可证的程序，已在背页较为详细地介绍了。

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