guarantee/ gærən'tiː /

1.noun [c] 
(assurance) 保证

2.noun [商] 
(warranty) 质保承诺

3.vt.[+success] [ safety] [ happiness] 
(promise) 确保

4.vt.
(ensure) 保证

5.vt.[+product] [ work] 
担保

a/no guarantee that...
有/没有…的保证
to guarantee (that)...
保证…
to guarantee to do sth
保证做某事