舯

* 船体长度的中点。民用船常指"垂线间长"的中点，军用船常指"载重水线长"的中点。 * 船体长度的中部

(translated) The midpoint of a ship"s length; commonly referring to the midpoint of the "length between perpendiculars" for civil vessels, and typically referring to the midpoint of the "load waterline length" for military vessels; The middle part of a ship