pledge, guarantee, assurance

名詞 guarantee:

1. a written assurance that some product or service will be provided or will meet certain specifications
   同義詞：warrant, warrantee, warranty
2. a pledge that something will happen or that something is true
3. a collateral agreement to answer for the debt of another in case that person defaults
   同義詞：guaranty

動詞 guarantee:

1. give surety or assume responsibility
   同義詞：vouch
2. make certain of
   同義詞：ensure, insure, assure, secure
3. promise to do or accomplish
   同義詞：undertake
4. stand behind and guarantee the quality, accuracy, or condition of
   同義詞：warrant

1. Blue skies are not a guarantee of continuing fine weather.
   蔚藍的天空不一定擔保天氣持續(xù)晴朗。
2. I guarantee that you'll enjoy yourself.
   我包你玩得痛快。
3. We cannot guarantee the punctual arrival of trains in fogy weather.
   霧天我們不能保證火車準時到達。
4. This radio has a two-year guarantee.
   這臺收音機保修兩年。
5. South winds in winter are a guarantee of rain in these parts.
   在這一帶，冬天刮南風是下雨的跡象。

guar.an.tee

n.（名詞）
Something that assures a particular outcome or condition:
擔保物：保證某一特殊結果或條件的東西：
例句：
Lack of interest is a guarantee of failure.
缺乏興趣肯定會導致失敗

A promise or an assurance, especially one given in writing, that attests to the quality or durability of a product or service.
擔保：一種字據(jù)或保證，通常為書面的，以保證某種產(chǎn)品或服務的質(zhì)量或耐用性
A pledge that something will be performed in a specified manner.
保證：對某事將以某種特定方式完成的保證

A guaranty by which one person assumes responsibility for paying another`s debts or fulfilling another`s responsibilities.
抵押品：一種約束某人還債或承擔某種責任的抵押品
A guaranty for the execution, completion, or existence of something.
保證物：保證某事的實施完成或存在的物品
A guarantor.
保證人
v.tr.（及物動詞）
guar.an.teed,guar.an.tee.ing,guar.an.tees
To assume responsibility for the debt, default, or miscarriage of.
擔保：承擔債務，違約或計劃失敗的責任
To assume responsibility for the quality or performance of:
品質(zhì)保證：承擔物品質(zhì)量或性能的責任：
例句：
guarantee a product.
保證產(chǎn)品的質(zhì)量

To undertake to do, accomplish, or ensure (something) for another:
承諾，保證：保證為某人去做（某事或獲得某物）：
例句：
guaranteed to free the captives; guarantees freedom of speech.
保證釋放犯人；保證言論自由

To make certain:
確定，落實：
例句：
The rain guarantees a good crop this year.
這場雨保證了今年有好收成

To furnish security for.
為…提供擔保
To express or declare with conviction:
管保：以肯定的態(tài)度表示或宣稱：
例句：
I guarantee that you`ll like this book.
我管保你會喜歡這本書

來源：
Alteration of Middle English garant [warranty]
中古英語 garant的變化 [擔保]
from Old French * see guaranty
源自 古法語 *參見 guaranty