open cover cargo insurance

例句：

1. 1.This policy covers all open-top cargo for the duration of the trip.
   这个保单覆盖了这次旅行期间的所有开顶货物。
2. 2.The ship's crew must ensure that all open-top cargo is properly secured before departure.
   船上的工作人员必须在出发前确保所有开顶货物都妥善固定。
3. 3.Open-top cargo is subject to higher insurance premiums than traditional containers.
   与传统的集装箱相比，开顶货物的保险费率更高。