The two rails are not only signal lines of track circuits, but also loop current line of locomotive traction current in electrified railway block.

电力牵引区段的两条钢轨，既作为轨道电路的通道来传输信号电流，又作为牵引电流的回路来传送牵引电流。

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In case you're not up on your STL, recall that for iterators the dereference operator returns the current object, so the line inside the for loop in the preceding snippet is equivalent to.

如果你对STL不熟悉，去看看有关迭代器反引用操作符的内容，它返回当前指向的对象，上面代码段中，for循环里的代码等同于。

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Index of the current line in a table control. This is set for every loop pass.

在表控制中当前行的索引。在每个循环过程中设置。

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