noun 下载 🔗分享 防腐剂,保鲜剂。 Any agent, natural or artificial that acts to preserve, especially when added to food. Examples : "The bread stayed fresh for a week because it contained preservatives. " 因为面包里含有防腐剂,所以一个星期后仍然很新鲜。 food substance chemistry 与AI对话词汇游戏阅读练习