要从池接口中释放内存，可以调用purge_memory方法。
To release memory from the pool interface, call the purge_memory method.
应用程序可以用此接口来分配和释放他们自己的内存。
Applications can also use this interface to allocate and free their own memory.
应用程序可以用此接口来分配和释放他们自己的内存。
Applications can also use this interface to allocate and free their own memory.
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