adj.非本質(zhì)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. 減少或者取消非必需的商務(wù)旅行，是削減商旅開支最常用的方法。

This "could be due to nonessential, potentially harmful trace elements contained in zinc supplements, such as cadmium, a known carcinogen," the researchers said. 研究人員說，這可能歸因于存在于鋅補(bǔ)充劑中的非必需的潛在有害微量元素，例如致癌物質(zhì)鎘。

非必需品