sea service

• 海上勤务

sea service的用法和样例：

例句

1. The medical service is a branch in the study of military medicine.
   卫生勤务是军事医学研究中的一个学科。
2. Special material supply and service support are provided by the services and arms through their organic channels.
   专用物资供应和专用勤务保障由军兵种按建制系统组织实施。