requiring immediate action的意思|示意

How to relieve traffic congestion in urban central area is becoming the key challenge requiring immediate action plans in large and medium cities.

如何缓解城市中心区交通拥堵是各大、中城市关注的焦点和亟须解决的问题。

A warning alert indicates a non-critical condition that might indicate a non-optimal system, while an alarm alert is a critical condition requiring immediate action.

提醒警报指明了一个非临界条件，这类警报可能意味着当前系统不是最优化的，而报警警报指明的是临界条件，要求立即采取行动。