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be sure about

对…有把握；确信

1、确信

...be serious about 对…是认真的；认真对待be sure about 对…有把握；确信be worried about 为…而担心，忧虑 ...

be not sure about对…不肯定

be sure about sth感到有把握或有信心;对某事很确定;请放心

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