大家都搜：
必需物质
1、harmful substances───[环境]有害物质
2、essential workers───基本工人
3、essential service───基本服务；必要服务
4、nonnutritive substances───非营养物质
5、substances───n.[物]物质；基本内容；物品药物（substance的复数）
6、essential skills───基本功
7、essential───n.本质；要素；要点；必需品；adj.基本的；必要的；本质的；精华的
8、essential skill───基本功
9、controlled substances───[医]管制物质；控制物质
1、None of this is to say that people must immediately bin all vitamin-containing substances; vitamins are, after all, essential nutrients.───这一切都不意味着人们应该立马将所有含维生素的物质弃之如敝屣。毕竟维生素是基本营养品。
2、more we learn, the more amazed we are by the wealth of essential substances they contain, Van Horn continues, and how they interact with each other to keep us healthy.───我们了解得越多，就越惊讶于它们所包含的如此丰富的人体所需基本物质，” 范·霍恩继续说道，“以及它们如何通过相互作用来维持人体健康。”
3、Effect of aerating treatment on physiological activities and essential substances in germinating brown rice───通气处理对发芽糙米生理活性及主要物质含量影响
4、Removing them from their normal environment deprives them of the company of other substances essential for their function.───将其从常态环境中提取出来则难免去除了一些对其功能攸关的其他物质。
1、Fat, glucoprotein , calcium, phosphorus, etc. are the essential substances for the activities of the brain. The simplest method to supplement these substances is to obtain them from foods.