surmark的翻译，读音
英/'sә:mɑ:k/
释义：
样板上肋骨斜角标记
n. A mark made on the molds of a ship, when building, to show
where the angles of the timbers are to be placed.
n. A mark made on the molds of a ship, when building, to show
where the angles of the timbers are to be placed.