single-channel type 单沟道型
One interface is provided for each type of channel exit, and each interface provides a single method to be implemented.
一个接口提供给每种通道出口，每个接口都提供一个需要实现的方法。
The class One2OneChannel, as the name indicates, implements a "single-writer-single-reader" type channel.
类 One2OneChannel，顾名思义，实现了“单一写入器/单一阅读器”类型的通道。
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