To correct the error, add double quotation marks to the end of line 9.
要想纠正这个错误，应该在第 9 行末尾添加双引号。
Be careful about your choice of single versus double quotation marks, as well.
在选择单引号和双引号时要小心。
You can use double quotation marks (") to include Spaces within an argument."
可以使用双引号(“)在参数中包含空格。”
You can choose single or double quotation marks according to the place you work.
你可以选择用单引号或者双引号，看你处于什么地方。
You can choose single or double quotation marks according to the place you work.
你可以选择用单引号或者双引号，看你处于什么地方。
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