英语易混淆词汇辨析：acute, critical, crucial, urgent

urgent a.意为“紧迫的，急迫的，紧要的”，它不强调所指的问题是最重要的，仅强调“紧急的”状态。

we have an urgent need for help; we are running out of water.
我们急需要帮助，我们的水就快要用光了。

he was urgent in his demands.
他的要求很迫切。

some urgent business took me away from shanghai.
有些紧急事务使我离开上海。

how fast can you post to the port with this urgent message?
你带着这份紧急信件能有多快通过驿站到达港口?