坐标轴;
Life can be made simpler by a wise choice of coordinate axes.
坐标轴选取得好就可以使问题简化.
Two perpendicular lines are chosen as the x and y coordinate axes.
选两条垂线作为x和y坐标轴.
The coordinate axes can be moved by rotating wheel.
通过旋转手轮能移动坐标轴.
According to the directions needed press the corresponding arrow keys to move the coordinate axes.
根据需要移动的方向,按下相应箭头键移动坐标轴.
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