stepped sector是什么意思

中文翻译阶梯遮光板

网络释义

1)stepped sector,阶梯遮光板2)step weakener,阶梯减光板3)neutral stepweaknener,中性阶梯减光板4)step sector,阶梯(减光)扇形板5)viser board,遮光纸板6)screening for lights,限光遮板