"立秋" is an important traditional Chinese festival that marks the beginning of autumn. It falls on the 7th day of the 7th lunar month according to the Chinese lunar calendar.

In English, you could say:
"Li Qiu is on the 7th day of the 7th lunar month and represents the beginning of autumn."
As for the second part of your question, "立秋是哪一天代表什么意思呀女生" seems to be a mix of Chinese and English. If you're asking what "Li Qiu" means for girls, it could be interpreted as:
"Li Qiu represents the beginning of autumn, which is a time of change and a new season for everyone, including girls."
This sentence emphasizes that the significance of Li Qiu is not gender-specific.
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