(1)危机(time of great difficulty or danger)[C，U]：the～in the Middle East中东危机;a～in the nation's domestic affairs这个国家国内事务的危机;a government/cabinet/political/financial/domestic～政府/内阁/政治/财政/国内危机;an economic/emotional～经济/感情危机;face/create a～面临/造成危机;in time of～在危难时刻;a government in～处于危机中的政府;a～situation危机状态;〖同〗emergency;

(2)转折点，紧急关头，关键时刻(decisive，turning point or situation in the course of anything)[C]： a～in one's life一生中的关键时刻;Things (Affairs) are coming to/drawing to/reaching a～.事情(事态)正临近紧要关头。bring things to a～使事情达到转折点;Negotiations between the two countries are approaching a～.两国间的谈判接近关键时刻。hold a～talk with sb与……进行关键性谈判;

(3)(疾病)转折点(turning point in the course of a serious illness，at which there is a sudden change for better or worse)[C]：Although he is still ill，he has passed the～.尽管他的病还没好，但已过了危险期。reach/get through the～到达/通过转折点;The fever has passed its～.发烧的危险时刻过去了。The～point was reached and then he got better. 危险期之后，他的病情就好转了。

→′critical adj;

【辨异】crisis与emergency都指需要采取迅速行动和进行快速判断的形势(尽管这些并不一定能防止有害结果的发生)。emergency(紧急情况)指需要立即采取行动的形势，如：A power failure created an emergency in transportation.(断电造成运输危机。)crisis是决定一切的关键性转折点，如：Help arrived when affairs had reached a crisis.(正当紧急关头，救援赶到。)