The " angle tolerance " indicates until which angle the machine should work as if it were a straight line 角度公差是指机器好像在作直线运动的最大角度。
2.
The example purposely uses an expected line angle somewhat different from the actual line angle to illustrate the angle tolerance you have to work with 这个例子故意使目标直线和实际直线之间有个角度差，目的是解释容许误差对查找的影响。
