a vicious circle

例句：

1. 1. The situation is a vicious circle that cannot be broken easily.
   这种状况是一个难以打破的恶性循环。
2. 2.The cycle of poverty is a vicious circle that affects many people.
   贫困循环影响了许多人们。
3. 3. The company's financial crisis has led to a vicious circle of debt and losses.
   公司的财务危机导致了债务和损失的恶性循环。