选定方向，永不回头。
您必须检查要排序的选定列是否刚好在已排序的列的前面，如果是这样，还需要确定已经排序的列的排序方向(升序或降序)。
You must verify whether the column selected to be sorted is the immediately preceding column to have been sorted and, if it is, in which direction (ascending or descending) it was previously sorted.
预先选定及驶入适当的行车。须依照行车上箭咀的方向行驶。
You must follow the direction given by the lane indication arrows for the lane in which you are driving.
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