那些渔船的数量是十五艘.The fishing boats were 15 sail in number.作者还对小型双体渔船的总布置及阻力特征作了阐述, 并对我国发展小型双体渔船问题提出了建议.Finally, author suggests the proposal about the development of small fishing catamarans in our country.驶近港口时, 渔民们开始放慢渔船的速度...