从心里因素中表现出来的推动力也不应该被忽视。
The psychological boost that represents should not be discounted.
既然我们关心教育，那么有两个因素我们必须时时记在心里。
It appears that as we are concerned with education, there are two factors we must bear in mind at all times.
然而，在这些干扰因素得到控制后，他还是发现，随着尼古丁含量的升高，被试显示出心里困扰的几率也随之增大。
But even after controlling for this factor, he found that the greater the levels of cotinine, the greater likelihood that the subject would show signs of psychological distress.
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