该可循环的信用证为通知循环，每通知一次，自动循环三个批次。
This may circulate the letter of credit is the notice circulation, every time informs a time, automatically circulates three raids.
还可以找到对后向堵塞通知(BCN)的支持，这以消息的方式加紧控制循环，从而改进了堵塞管理。
You'll also find support for backward congestion notification (BCN), which improves congestion management by actively tightening the control loop through messaging.
当事件发生时，与这个事件对应的对象发出信号，通知主循环事件已经发生。
When an event occurs, the object associated with that event emits a signal to inform the main loop that it has occurred.
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