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封面页应加一个脚注如下：
a footnote should be added to the cover page, reading:
Last Update: 2016-12-04
Usage Frequency: 2
Quality:
18. 在第5款的结尾增加脚注如下:
18. add the following footnote to the end of paragraph 5:
Last Update: 2016-12-04
Usage Frequency: 4
Quality: