1
- a formal promise or assurance (typically in writing) that certain conditions will be fulfilled, especially that a product will be repaired or replaced if not of a specified quality and durability（尤指书面的）保证书; 商品保修（或保换）单：
we offer a 10-year guarantee against rusting.
我们提供十年不生锈的保证。
1.1
- something that gives a certainty of outcome起保证作用的事物：
supervision can't be a guarantee against a new offence.
监管不能成为不再违法的保证。
(guarantees, guaranteed, guaranteeing)no obj.
1- provide a formal assurance or promise, especially that certain conditions will be fulfilled relating to a product, service, or transaction作保证（尤指保证与产品、服务或交易相关的某些条件的实现）：
with infinitive the company guarantees to refund your money.公司保证退还您的钱。
1.1
- with obj. provide such an assurance regarding (something, especially a product)为（某物, 尤指产品）保证; 保用（产品）：
the cooker is guaranteed for five years
本炊具保用五年
as adj. guaranteed the guaranteed bonus is not very high.保付的红利并不很高。
1.2
- with obj. provide financial security for; underwrite为…做经济担保; 为…具保：
a demand that £100,000 be deposited to guarantee their costs.
为他们的花费支付十万英镑定金作担保的要求。
1.3
- with obj. promise with certainty确保：
no one can guarantee a profit on stocks and shares.
没有人能确保在股票上一定盈利。
词源
late 17th cent. （in the sense 'guarantor'）： perhaps from Spanish garante, corresponding to French garant （see WARRANT）， later influenced by French garantie 'guaranty'.