closed contract of insurance

例句：

1. 1.The closed contract of insurance is a crucial factor in determining the cost of coverage.
   保险合同的封闭条款是决定保费的关键因素。
2. 2. The company's policyholders have a right to cancel their insurance contracts at any time without penalty.
   该公司的保单持有人可以随时取消保险合同而无需支付罚款。
3. 3. The closed contract of insurance provides protection against certain risks, but it may not cover all possible losses.
   保险合同的封闭条款提供了对某些风险的保护，但它可能不涵盖所有可能的损失。