小箭头不是尺寸不对就是在错误的位置，抑或是颜色不对。
The little arrows were the wrong size, or in the wrong place, or the color was off.
加入箭头、尺寸和标注。
当给子程序的参数赋以初值后，由计算机控制自动绘图机绘制出尺寸界线、尺寸线、箭头和注写尺寸数字。
After the subroutine parameter is given the origin number, the plotter controlled by computer can draw out automatically extension line, dimension line, arrowhead and write dimension figures.
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