sure about 肯定;对…确信的
- But researchers aren't sure about all the factors that control the chain.
但是研究人员不能确定所有的因素都包含在链条里。 - I shall certainly be present at the meeting, but I am not sure about my wife.
我肯定会出席会议,但我的妻子是否出席,就不敢肯定了。 - Good quality is important to them, and they believe they can not be sure about the quality of the things on TV.
好的质量对于他们来说很重要,而且他们相信他们无法确定电视上的商品的质量。
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