A virtuous cycle should be created for the high-quality development of the food industry.

食品工业要想获得高质量发展，需要建立良性循环。

The economy enters a virtuous cycle of development.

经济发展进入良性循环。

What was once a virtuous cycle has turned vicious.

以往的良性循环变成了恶性循环。

来源：同文世纪翻译，转载请注明出处！