[] one of the things from which sth is made成分◆The only active ingredient in this medicine is aspirin.此药唯一的活性成分是阿司匹林。◆A food safety agency has been set up to approve new food ingredients.食品安全机构已经成立以批准新的食品成分。one of the things or qualities that are necessary to make sth successful（成功的）因素，要素◆Customer loyalty is one of the key ingredients in business success.顾客忠诚度是企业成功的关键要素之一。