根据现有系统已指定有送件人的公司不需再指定一个送件人。
Companies that have already designated a Courier under the current system do not need to re-designate a Courier.
您首先要画出正方形，然后再指定该显示窗口后面绘制图形的旋转操作。
You draw your square first, then specify the rotation operation that is applied to the subsequent shapes drawn to the display window.
gnuplot假设要绘制的其他列也参照x轴，所以在plot命令中不需要再指定xtic。
Gnuplot assumes the rest of the columns to be plotted will reference that as well, so there is no need to specify the xtic again within the plot command.
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