additional premium for short period cover

例句：

1. 1.The insurance company added an additional premium to the policy for the accident coverage.
   保险公司在保单中增加了额外的保费，以覆盖事故险。
2. 2.The customer asked for an additional premium for the extended warranty.
   客户要求增加额外的保费以获得延长保修服务。
3. 3. The car dealership offered a discount on the purchase price, including an additional premium for extended warranties.
   汽车经销商在购买价格上提供折扣，包括对延长保修服务的额外保费。