I'm not really sure
I'm not really sure.我不太清楚。
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今天的几个句子是有关肯定与否定的：1.Make sure about the data source. 弄清楚数据来源。2.He is not sure about maths. 他对数学没有把握。3.Do you feel sure about it.你能对这有把握吗?
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