The more pesticides are used, the more resistant the insects become so the more pesticides have to be used. It's a vicious circle.

杀虫剂使用得越多，那些昆虫的抵抗力越强，因此就要使用更多的杀虫剂。这是一个恶性循环。

《柯林斯英汉双解大词典》

So deflation in asset prices can turn into a vicious circle.

因此，资产价格的紧缩会带来恶性循环。

youdao

So we are back again at dependence, a vicious circle.

所以我们又回到了依赖，一个恶性循环。

youdao

So Japanese firms are caught in a vicious circle: because they are not selling to poor countries, their volume stays low, which keeps prices high, which makes selling to poor countries infeasible.

ECONOMIST: Why Japan lost the mobile-phone wars