傍晚交通高峰期，车流速度总是会显著减慢。

The traffic flow always ___slows down considerably during the evening rush hour.

接近环岛时，请放慢车速。

Please ___slow the vehicle as you approach the roundabout.

这项新政策旨在减缓自然资源的快速消耗。

The new policy aims to ___slow the rapid depletion of natural resources.