flex cycle

例句：

1. 1.The flexible cycle of the economy is crucial for stability.
   经济的弹性周期对于稳定至关重要。
2. 2.The company's new product line follows a flexible cycle of development and testing.
   该公司的新产品线遵循一个灵活的开发和测试周期。
3. 3. The cycle of life is a fascinating concept that explains the natural progression of growth and decline.
   生命循环是一个引人入胜的概念，它解释了自然的生长和衰退过程。