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。

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

《柯林斯英汉双解大词典》

研究描述了facebook的使用与嫉妒之间的恶性循环，最终产生对关系的破坏行为。

The article describes a vicious cycle in which Facebook usage and feelings of jealousy become intertwined and have a negative influence on behavior and relationships.

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避免使用日光浴浴床。35岁之前使用日光浴浴床与恶性黑素瘤风险增加75%之间有关联。

Avoid sunbeds: use of sunbeds before the age of 35 is associated with a 75% increase in the risk of melanoma.

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