词源单词串记： Cred来自拉丁文credere cred=to believe
credible Incredible Unbelievable Accredit —Accredited Credulity Incredulous Creed
credible [ ˈkredəbl ] adj.可信的，可靠的; Mr Robertson would be a credible candidate. 罗伯逊先生将是可能当选的候选人之一。 Offer you a credible scheme Incredible [ɪnˈkredəbl] adj.难以置信的; 不可思议的; 惊人的; 未必可能的; The incredible beauty of a snowflake 雪花难以置信的美丽 It is incredible that 难以想象… Awesome /gorgeous /fantastic /wonderful
Undervalue [ ˌʌndəˈvæ lju: ] vt.估价过低; 轻看 We must never undervalue freedom.
Devalue[ ˌdi:ˈvæ lju: ] vt.使（货币）贬值; 贬低 vi.（货币）贬值 We are not going to devalue the pound. 我们不会让英镑贬值， It's unfair to devalue anyone's work.
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Creed [ kri:d ] n.（尤指宗教）信条，教义; 主义，纲领; 宗派 This is an indispensable part of his creed. 这是他的信条中必不可少的一部分. The centre is open to all, no matter what race or creed. 该中心向所有人开放，不论种族和宗教信仰如何。
1)to be of worth Evaluate [ ɪˈvæ ljueɪt ] vt.评价; 对…评价; vi.评价，估价 I can't evaluate his ability without seeing his work. 我没有看到他的工作情况,无法评论他的能力。 Don't evaluate a person on the basis of appearance.
preach one's creed
credible Incredible Unbelievable Accredit —Accredited Credulity Incredulous Creed
基础词汇：Value [ˈvæ lju:] n.价值，价格; 意义，涵义; 重要性; vt.评价; 看重; 估价，给…定价; 词根词源： val、vail 来源于拉丁文: (1)to be of worth (2)to be strong (3)to be effective
Accredit [əˈkredɪt] vt.归因于; 委托，授权; 相信，认可;鉴定合格，确认达标; We accredit the invention of the telephone to bell. 我们把电话的发明归功于贝尔。 The president will accredit you as his assistant. 董事长将任命你做他的助理。
Accredited [əˈkredɪtɪd] adj.公认的; 可接受的; 可信任的; 质量合格的; find accredited travel agents to guide you on your holiday plans. 找到可信任的旅行社安排你的假期。
Incredulous [ɪnˈkredjələs] adj.表示怀疑的，不相信的 There was a brief, incredulous silence. 有一段短暂的充满怀疑的沉默。 People nowdays are incredulous about ghosts and witches. 现在的人们对鬼和巫婆都不相信了。
2)to be strong Valiant[ ˈvæ liənt ] adj.勇敢的，英勇的; 坚定的 n.勇敢的人，勇士
Valiant warriors The valiant Valor n.勇猛，英勇
Prevail [ prɪˈveɪl ] vi.流行，盛行; 获胜，占优势; 说服，劝说 Prevail in/among sth 普遍存在，流行 Similar situation prevails in America 相似的情况在美国随处可见。 Those beliefs still prevail among certain social groups.
Prevail over/against sth 被接受,被压倒 Justice will prevail over evil.
Prevalent[ ˈprevələnt ] adj.流行的，盛行的; 普遍存在的，普遍发生的 盛行的; 普遍存在的，普遍发生的 Smoking is becoming increasingly prevalent among younger women. 抽烟在年轻女性中变得越来越常见。 Prevalence ['prevələns] n.流行 盛行 The prevalence of…
3)to be effective Valid [ ˈvæ lɪd ] adj.有效的; 有法律效力的; 正当的; 健全的 valid contract /will/passport It is valid to consider memory the oldest mental skill Validate [ ˈvæ lɪdeɪt ] vt.使合法化，使有法律效力; 使生效; 批准，确认; 证实 Validate a theory 证实理论 Validate a contract 使合同生效 The Academy Awards appear to validate his career. 奥斯卡金像奖似乎是对他事业的肯定。 validation[ˌvæ lɪ'deɪʃn] n.确认; 合法; 证实;
1)to be of worth Evaluate Undervalue devalue 2)to be strong Valiant Valor Prevail — Prevalent —prevalence 3)to be effective Valid Validate —validation
基础词汇：Credit vt.信任，把…归于；付款入账 n.赞扬，称道；及格证，学分；贷款额（信用度） Now he needs only two credit hours to graduate. A television that we bought on credit two months ago. 我们两个月前赊购的电视机.
Unbelievable [ ˌʌnbɪˈli:vəbl ] adj.不可相信的; 站不住脚的; （由于太好或太糟而） 令人难以置信的 It was an unbelievable moment when Chris won the gold medal. 克里斯赢得金牌的那一刻令人不可思议。 Credulity n.轻信,易受骗 He is known for his credulity. 他是个有名的棉花耳朵。
1)to be of worth Evaluate Undervalue devalue 2)to be strong Valiant Valor Prevail — Prevalent
3)to be effective Valid Validate —validation