The scientist, however, goes one step further, he must be sure that he has a reasonableanswer to his questions and that his answer can be confirmed by other persons.
然而，科学家比这更进一步，他必须确定他对自己的问题得出了一个合理的答案，并且他的答案通过别人也可以得到证实。
She was already sure that he must be Peter, but it did seem a comparatively short name.
她已经知道，他一定是彼得，但相比之下，这个名字似乎有点短。
Los Angeles physician Bill Kelly echoes the comments of many others, saying he knows that something must be done to avert a financial crisis, but he is not sure the proposed plan is the right one.
洛杉矶一位名叫比尔·凯利的医生的看法就很有代表性。他说，为了防止一场金融危机，必须采取一些行动，但是他并不认为救市计划是正确的。
We must also accentuate the positive and make sure that a sensitive young child doesn't conclude he or she is bad even though the behavior might be.
我们应该积极地引导他们，不要让敏感地孩子认定自己很糟糕，即使孩子做了什么错事。
De Boer says that he would be happy if the paper turns out to be correct, but researchers must first be sure that its conclusions are not "caused by some methodological artifact we have all missed."
DeBoer认为如果这篇论文经证实是正确的，他会为此感到欣慰，但是研究者必须首先确保其结论不是由被我们所忽视的那些方法中的人为因素引起的。
I'm sure that he must be there.
我确信他一定在那儿。
I'm sure that he must be there.
我确信他一定在那儿。
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