This depends on a number of factors, notably how sure you are of what you want you study and how many academic interests you have outside of your expected major.
这取决于许多因素，尤其是你有多确定自己想学什么，以及在你期望的专业之外还有多少别的学术兴趣。
How sure would he need to be about the identity of an attacker to "fire back"?
为确定攻击者身份并“反击”，他需要多大把握？
How sure are we that this kind of change in the environment would not lead to catastrophe?
我们有多大把握这种环境变化不会引起灾难？
How sure are we that this kind of change in the environment would not lead to catastrophe?
我们有多大把握这种环境变化不会引起灾难？
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