certify
单词辨析：
指以口头或书面形式作保证、担保、承诺，含若违背则予以补偿之意。
I can guarantee that he will pay off the debt.
我可以保证他会还清债务的。
I can't guarantee I will finish the work before dark.
我不能保证天黑前完成那项工作。
The law guarantees equal rights for men and women.
法律保证男女平等。
指用言语承诺某事一定会发生或一定是真实的，以消除他人的疑虑或担心。
I can assure you that your daughter will be happy here.
我可以向你保证，你女儿在这里会很快乐的。
We assured the tourists of an enjoyable holiday.
我们使游客确信准能过一个愉快的假期。
较正式用词，指向他人保证某人或某事物可靠、没有问题等。
certify sb's honesty and reliability
担保某人诚实可靠
I certify on my honour that she is innocent.
我用名誉担保她是清白无辜的。
指保证一定会做某事或提供某物，或某事一定会发生，侧重于自己的主观意向，用言语使人感到放心。
He promised to return the money to me.
他保证把钱还给我。
He promised her that he would marry her.
他保证要娶她。
指以发誓的形式作出保证，或强调自己所说的是真话。
He swore that he would get his revenge.
他发誓要报仇。
I never touched his wallet, I swear!
我绝没有碰过他的钱包，我发誓！
He swore never to gamble again.
他发誓再也不赌博了。
普通用词，指以事实等证明某事是真实的。
Tests have proved that the method works.
实验证明该方法有效。
How can you prove that he has cheated in the exam?
你如何证明他在考试中作弊了？
尤指经过某种检验而证实某事正确或真实。
The accounts of that company were certified by the investigators.
那家公司的账目经调查员核实过。
She had to show the paper to certify that she was in good health.
她得出示她的健康证明。
指通过更多的证据确定某事是真实的。
They need new evidence to confirm his story.
他们需要新的证据来证实他的说法。
To confirm her conjecture, she has to do some tests.
为了证实她的猜测，她需要做一些试验。
指清楚地论证或证实某事。
His study demonstrates the link between sleep quality and work performance.
他的研究证明了睡眠质量和工作表现之间的联系。
You have to demonstrate that you are reliable.
你得证明自己是靠得住的。
指清楚地说明某种情况，常后接介词 to。
Skyrocketing prices testify to the depth of the inflation.
飞涨的物价说明了通货膨胀的严重程度。
The waste paper and cigarette ends that can be seen everywhere testify that littering hasn't been stubbed out.
随处可见的废纸、烟头说明乱扔杂物的习惯并未得到根除。
相关例句：
We, hereby certify that the views expressed in this research report accurately reflect our personal views.
我们特此保证，本研究报告中的观点准确反映了我们的个人观点。
I certify I am the IRA holder or eligible beneficiary authorized to make these elections.
我证实，我是个人退休帐户的持有人或经授权作出如上选择的合格受益人。
I believe it to be true, but I am not able to certify to that effect.
我相信它是真的，但我不能证实其真实性。
Ultimately, whether you choose to certify is a cost/ benefit decision.
归根结底，是否选择进行认证是一个比较开销和受益的决策。
They wanted to get certified as divers.
他们想拿到潜水员资格证。
By clicking Submit Agreement, you certify that you have read and agree to the terms and conditions.
通过点击提交协议，您证明您已阅读并同意的条款和条件。