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.
The coordinate axes can be moved by rotating wheel.
通过旋转手轮能移动坐标轴.
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.
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