这个补丁通过把已缓存的引用从一个序列号转换为指向队列中最高的包（过去已经选择性应答）的指针从而对此情况加以优化。
The patch optimizes this case by converting the cached reference from a sequence number to a pointer to the highest packet in the queue that has been SACKed in the past.
所以，如果一个字节序列可以是一个指向一块被分配的内存的指针，那么收集器就将其标记为正在被引用。
So, if a sequence of bytes could be a pointer to a piece of allocated memory, it marks it as being referenced.
通过使用引用，可以告诉函数指向信息的指针。
By using a reference, you tell the function to point to the information.
引用是应用程序的特定指针，该指针指向通常存在于更大的上下文(如服务器或集群)中并且供多方使用的对象。
A reference is an application specific pointer to an object that usually lives in a larger context, such as a server or cluster, and is used by multiple parties.
常量池引用被与指向内部数据结构的指针取代，成功的或者某种工作方式会被一种简单的形式替代。
Constant pool references are replaced with Pointers to internal data structures, operations that always succeed or always work a certain way are replaced with simpler forms.
结构是值类型，类是引用类型-类始终提供至少一级内存间接寻址(指向某一值的指针)。
Structures are value types and classes are reference types - classes always provide at least one level of memory indirection (a pointer to a value).
使迭代器失效，并会改变元素的顺序。指向元素的指针和引用不会失效。
Invalidates iterators, and changes the order of elements. Pointers and references to elements are not invalidated.
如果一个指针指向一个不在图中的对象，那么此对象就是一个不可到达的对象，垃圾收集器就将短弱引用表相应的槽置空。
If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the short weak reference table.
获取指定类型的数组、或一个指向指定类型的指针或对指定类型的引用。
Gets an array of the specified type, or a pointer or reference to the specified type.
如果一个指针指向一个不在图中的对象(注意此时图中已包含Finalize可到达的对象)，那么此对象就是一个不可到达的对象，垃圾收集器就将长弱引用表相应的槽置空。
If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the long weak reference table.
如果一个指针指向一个不在图中的对象(注意此时图中已包含Finalize可到达的对象)，那么此对象就是一个不可到达的对象，垃圾收集器就将长弱引用表相应的槽置空。
If a pointer pointing to an object not in the graph, then the object is not a reachable object, and then garbage collector sets the slot to null in the long weak reference table.
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