The next four lines restrict the movementof the mouse to the maximum distance from the center in each dimension.
接下来的四行代码将鼠标移动限制为从每个维度中心移动的最大距离。
2
Finally, the mouse position is reset to the center if the aforementioned threshold ofmovement has not been reached.
最后,如果没有达到上面提到的移动阈值,则将鼠标位置重置到中心。
3
The extensive system has allowed the city to phase out much car traffic in its center, while preserving the efficient movementof people from the city center to outlying regions.