Once sending a segment, TCP sets a timer and waits for the ACK.
每发出一个报文段，TCP就设定一个定时器并等待确认信息。
参考来源 - 置位法解决TCP重传二义性问题·2,447,543篇论文数据，部分数据来源于NoteExpress
Determining the hemisphere is easy: latitude zones a, C, d, e, F, g, h, J, K, l, and m are in the Southern hemisphere, and the rest are in the Northern hemisphere.
这种确定非常简单：纬度区a、C、D、E、F、G、H、J、K、L和m位于南半球，而其余区位于北半球。
Choose a moisturizing eye cream that contains vitamins a, k, and C. vitamin a is an antioxidant that breaks down unstable oxygen molecules that would otherwise harm your skin.
维生素a是一种可以分解对皮肤有害的不稳定的氧分子的抗氧化物。
Cauliflower is a great source of vitamin c, which may elevate your mood, and vitamin k, which can keep your mind sharp in your older years.
菜花是维生素c的一大来源，它可以提高你的情绪，维生素k能让你在老年仍保持思维敏捷。
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