英语翻译问题,急求解原句是：One of the characterristics of our times is thus the rapidity with which steps can be taken to change the orientation of certain trends and even to reverse them.书上翻译是：我们这个时代的特点之一就是采取措施来改变甚至逆转某种趋势的速度.我不理解的是thus the rapidity with which怎么翻译?什么意思啊?求解

英语翻译问题,急求解
原句是：One of the characterristics of our times is thus the rapidity with which steps can be taken to change the orientation of certain trends and even to reverse them.
书上翻译是：我们这个时代的特点之一就是采取措施来改变甚至逆转某种趋势的速度.
我不理解的是thus the rapidity with which怎么翻译?什么意思啊?求解