To be able to acquire the whole profile of the rail head two LLT sensors are required.

采用激光轮廓扫描仪的好处是无接触，精准以及快速。 为了得到铁轨整体外轮廓，需要两支轮廓扫描仪同时工作。

As mentioned previously, low latency transport (LLT) provides notification of reliable versus unreliable network communications to global atomic broadcast (GAB).

如前所述，low latency transport (LLT)(低延迟传输)提供可靠的通知相对应于提供不可靠网络通信的global atomic broadcast (GAB)(全球广播)。