Examples

在革命的重要关头

at important junctures of the revolution → 关头

生死存亡的紧要关头

a critical moment of life-and-death importance → 关头

她在紧急关头总是沉着机敏。

She is calm and resourceful in an emergency. → 机敏

紧要关头

critical moment (or juncture); crucial moment → 紧要

这个国家到了生死存亡的关头。

That country has reached a point where its very existence is at stake. → 生死存亡

危急关头

critical juncture (or time, moment) → 危急

严重关头

critical juncture → 严重

重要关头

critical juncture → 重要

他做事历练稳重， 总能在危机关头随机应变， 化险为夷。

He handles affairs neatly, maturely, and always plays to the score at critial moment to head off danger. → 历练

不到紧急关头不要亮出撒手锏。

Don't reveal your trump card before the crucial moment. → 撒手锏

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