有关舱盖板的问题

lxy114

有段关于舱盖修理的描述：anti-corrosive powder retaining plate to be removed from the underside of the hatch cover forward pontoon 请问anti-corrosive powder retaining plate指的是什么？

王者到达

anti-corrosive powder retaining plate to be removed from the underside of the hatch cover forward pontoon
这个板应从舱口盖的下前浮筒移除。
有防锈粉的支撑板？
非专业翻译，不知道是哪种船型船的舱口盖。