People have developed many underwater unmanned vehicle in order to detect and empolder resources in ocean or get the thalassocracy 人类为了探测和开发海洋资源或在军事上取得制海权，已经研制出了多种小型潜器。
2.
Until 18th century , a passel of large , powerful wooden ships , which were called battleships , had been built , in order to make the northern european navy , who were engaged in naval battles , gripped the thalassocracy and profitable trading lanes 至18世纪时，为了使从事海战的北欧海军能掌握制海权及利润丰厚的贸易通道，建造了一批火力强大的被称为战舰的大型木船。
