The 55m patrol vessel uses a steel monohull with a round bilge semi-displacement hull, incorporating very fine V-shaped frames in the forward sections.是什么意思_The 55m patrol vessel uses a steel monohull with a round bilge semi-displacement hull, incorporating very fine V-shaped frames in the forward sections.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句