We have reached a critical moment in the negotiations.我们到了谈判的关键时刻。A new problem cropped out at this critical moment.就在这个节骨眼儿上突然出现了一个新问题。We had better call in a specialist at this critical moment.在这个关键时刻我们最好请一位专家来。This was a critical moment in his career.这是他事业发展的关键时刻。