英语话题作文答:话题范围具体话题英文核心词社会效率、经济发展、人口需求、产品质量、满意度、文化、环境efficiency, revolution, culture, economic development, population, needs, quality, price, tension, natural resources financial, efficient, environmental recycle, protect生活健康类、新通讯工具类、节约和浪费、交通、食品安全int...