27.open gratings over generator to be replaced by solid nonship checkered steel plate.
打开发电机上面的格栅并由固体防滑制动板取代。
英语百科
Diamond plate
Diamond plate, also known as checquer plate, tread plate and Durbar floor plate, is a type of lightweight metal stock with a regular pattern of raised diamonds or lines on one side, with the reverse side being featureless. Diamond plate is usually steel, stainless steel or aluminum. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design.