中文: abbr. Natural Gas and Petroleum Association of Canada 加拿大天然气和石油协会; Natural Gas Processors Association 天然气加工协会; neurite growth promoting activity 轴突生长促进活性
中文: abbr. negotiation 谈判; night 夜晚; national gas taper (threading) 国家输气锥管(螺纹); next-generation trainer 新一代训练师