Ngb
abbr. negative guard board 底片档板，阴极档板
🗣️ 情景例句
May I bring you a salad?
要不要来点沙拉呢？
Come to me if you're in any difficulty.
有困难来找我。
Moondwellers will be able to fly in space at only three percent of the cost of similar journeys by their terrestrial cousins.
月球居民在太空遨游的费用仅是地球上朋友飞越同样路所需费用的3%。