下面回答第二题，不要像第一题那样花那么多时间。
To answer the second question, don't take as much time as you took for the first question.
两次练习测验中,都有一道题是关于变量替换的,感觉这是很重要的那样。
There is one change of variable problem on each of the two practice exams to give you a feeling for what's realistic.
两次练习测验中,都有一道题是关于变量替换的,感觉这是很重要的那样。
There is one change of variable problem on each of the two practice exams to give you a feeling for what's realistic.
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