adj.非本质的；非必需的
n.不重要的人或物
Reducing or eliminating nonessential travel was the most frequently reported method of cutting business travel expenses. 减少或者取消非必需的商务旅行，是削减商旅开支最常用的方法。
This "could be due to nonessential, potentially harmful trace elements contained in zinc supplements, such as cadmium, a known carcinogen," the researchers said. 研究人员说，这可能归因于存在于锌补充剂中的非必需的潜在有害微量元素，例如致癌物质镉。
非必需品
