第一个可能的未来改变是对未应答的包列表进行修改，因此包列表的组织形式不再是当前的线性列表而是通过索引组织成红-黑树。
The first potential future change would modify the unacknowledged packet list so that it is organized with an index as a red-black tree instead of the current linear list.
这天早晨，他脚边放着他那破旧的黑包，外公的身子直发抖。
This morning, his tattered old black bag was by his feet, and my grandfather was obviously shaken.
他携带一个大黑包并且开始从中拿出百多扎万元每捆的RMB。
He had a big black bag with him and he started pulling out hundreds of thousands of RMB.
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