Subsequent levels leave their mark until another level 0 is done.
后续级别的备份会保留它们的标记，直至执行另一次0级备份。
The missile went level to its mark .
火箭准确地打中目标了。
Stop bit send by transmitters are always placed in the mark level.
由发送器所送出的停止位总是被设置成信号电平。
Stop bit send by transmitters are always placed in the mark level.
由发送器所送出的停止位总是被设置成信号电平。
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