她需要理解自信的重要性。
这两项研究也考察了学生在他们数学能力方面的自信程度，以及他们认为的学好数学以拥有一个好前程的重要性。
The two studies also assessed students' level of confidence in their math abilities and how important they felt it was to do well in math in order to have a successful career.
如果他没有破门，上周没有破门，他不会在今天主罚那个点球，这告诉了你自信的重要性。
If he had not scored his goal, and not scored last week, he would not have taken the penalty today and that tells you the importance of confidence.
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