英语中几个意思为"提高,加强,增加"的单词的辨析

enhance vt.{及物动词}提高,增加,加强增强表达事物的变化,值得关注.For exanple：Passing the College English Test Band-6 should enhance your chances of getting a better post.通过了大学六级考试会增加你获得更多职位的机会.
To survive in the intense trade competition between countries,our company must enhance the qualities and varieties of our products to meet the world market demand.为了在激烈的国际贸易竞争中生存下来,我们公司必须提高产品质量,增加产品品种以满足国际市场的需求.