You may not use any of the words in the bank more than once.
词库中的单词只能使用一次。
One name you may not use is "root".
一个名字你不要去用,“ root ”。
You may not use this work for commercial purpose.
不可以把作品用于商业目的。
Sometime later, I will deal with functions of more than one variable, which I will briefly introduce to you, because that may not be a prerequisite but certainly something you will learn and you may use on and off.
再过段时间,我要开始处理多变量函数,到时候我会向你们进行简单介绍,因为那不是必须的,但是你们以后会学到,有时候还能派上用场
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