采用正交分频多工而不采用单载波技术的原因为其用于处理高通道延迟扩散问题的等化器具有较低的复杂度。

Rather than a single carrier solution, OFDM is chosen as a result that its equalizer dealing with the problem of high channel delay spread has lower complexity.

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顾名思义，FixedDelayInt将来自其输入通道的值在固定延迟(在示例代码中，该延迟是1秒)之后发送到它的输出通道。

As its name indicates, FixedDelayInt passes data coming in through its input channel onto its output channel after a fixed delay — one second in the example code.

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想象一下另一种设计(常规PHP服务器会自己尝试处理对数据库本身的写入)：每个tweet都会在写入数据库时导致一个短暂的延迟，因为数据库调用正在阻塞通道。

Imagine another design - a normal PHP server that tries to handle writes to the DB itself - every tweet would cause a small delay as its written to the DB since the DB call would be blocking.

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