滑码告警是在传输层标头标示设备有没有帧丢失！
The LOF is a condition transmitted in the physical overhead indicating that the receiving equipment has lost frame delineation .
这条鲨鱼距离孩子不过三十码左右，并以同样的姿势继续滑近。
The shark was about thirty yards from the boy, coming in with the same sliding motion.
这条鲨鱼距离孩子不过三十码左右，并以同样的姿势继续滑近。
The shark was about thirty yards from the boy, coming in with the same sliding motion.
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