Notice I close the quotes after I'm putting a new line-- after I'm putting this new line, name but then to the right hand side is comma name.

注意反斜杠n后面加上后引号-,后引号，再右边就是逗号。

哈佛公开课 - 计算机科学课程节选

On the other hand, we've seen n that if the size of a is n, that's to say, we have n elements to choose from, then the number of possible subsets is 2 to the n.

另一方面，我们看到,如果a集合的大小是，也就是说我们有n个元素可供选择，而可能的子集的元素,个数就是2的n次方。

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