危险期的英文：
crises
crisis

Many methods carry health risks; barrier devices and avoidance of intercourse during the most fertile period are safest.
许多避孕方法会损害健康;最安全的方法包括使用阻隔式避孕器以及危险期推算法。

Future crises were handled crisply.
后来的一次次危机都处理得干净利落。

We can't forecast political crises well.
我们不能很好地预测政治危机。

In crises the most daring course is often the safest.
面临危机时，最大胆的方针往往最安全。

The collapse of the government was merely the climax of a series of constitutional crises.
政府垮台仅仅是一系列危机的最高潮

Periodic crises wrack the capitalist system, and they grow in size and duration.
周期性的危机破坏着资本主义制度，这种危机的规模在扩大，时间在延长。

Weather a crisis.
平安渡过危机

The crisis peaked in July 1974.
那场危机在1974年7月达到巅峰。

The country weathered the energy crisis.
该国渡过了能源危机。

They were aware of a budding crisis.
他们意识到萌发中的危机。

precipitate a country into a crisis
使一个国家突然陷入危机