All very interesting, Sherlock, but the terror alert has been raised to
critical .,——Sherlock,一切都很有意思，夏洛克，但恐怖袭击预警等级已达到"
危急 “。,——《神探夏洛克》,
一、关于critical，你应该知道的用法有 ,
adj. ,
1.紧要的，关键性的，决定性的 extremely important because a future situation will be affected by it,We are at a critical time in our history.,我们正处于历史的紧要关头。,
2.评判性的，审慎的 involving making fair, careful judgements about the good and bad qualities of *** / sth,He has recently published a critical work with Oxford University Press.,他最近在牛津大学出版社出版了一本评论著作。,
3.批评的，挑剔的 inclined to criticize severely and unfavorably,The director is always very critical of employees' work.,主任总是对员工的工作提出批评。,
4.危急的，严重的 serious, uncertain and possibly dangerous,Its day-to-day finances are in a critical state.,其日常财务状况十分糟糕。,
5.临界的 being in or approaching a state of crisis,Pesticide persistence beyond the critical period for control leads to residue problems.,农药一旦超过控制的临界期，就会导致残留问题。,
二、词义辨析：哪些词汇能表示“紧急的” ,
critical, acute, urgent ,这些形容词均有“紧急的”或“严重的”之意。
critical指极为危急或缺乏的状况，而这种状况标志一种转折点。
acute通常指需要和缺乏的紧急程度。也指病情的严重。
urgent指情况紧急，急需解决问题。,
三、下面我们来学习一下含有critical的常见短语 ,critical point,临界点,critical angle,n.[物][空]临界角,critical mass,羣聚效应 ,
四、最后，做个填词游戏吧 ,The first 24 hours after the operation are the most ________.
病人手术后头 24 小时是最危险的。