Figure 2 below shows the different layers through which the TCP system call propagates before being sent out on the physical link.

图2显示了TCP系统调用在物理链路上发出之前进行传播的各个层。

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Even then, the implementations of TCP (for a stream protocol) or UDP (for a message-based protocol) serve as useful models for starting out with new development.

即使现在，TCP(用于流协议)或UDP(用于基于消息的协议)的实现都可以作为开始新开发有用模块使用。

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When a bulb burns out before its projected 10,000-hour life, TCP replaces it.

如果某个灯泡还没达到预计的10,000小时寿命就坏掉了，TCP会负责更换。

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