有些实现打开读取通道作为长期HTTP GET，而另外打开写入通道作为HTTP POST，在需要时打开和关闭。

Some implementations open a read channel as a long HTTP GET, while a write channel opens and closes when needed as an HTTP POST.

youdao

读取进程彼此竞争使用的通道，写入进程也一样。

Reading processes compete with each other to use the channel, as do writing processes.

youdao

主线程把从通道读取的数据写到管道中。

The main thread writes bytes read from the channel into the pipe.

youdao