To be complete strangers; to have never met or known each other before.
他们虽然住在同一个小区，但因为作息时间不同，彼此素不相识。
Although they lived in the same community, they were complete strangers to each other due to their different daily routines.
Era:
Ancient
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Story:
During the Three Kingdoms period, Lu Mao, the younger brother of Lu Xun from the State of Wu, was known for his generous nature and kind heart.
Xu Hou, a man from the same prefecture, was equally upright.
Although Xu Hou and Lu Mao were complete strangers, Xu Hou greatly admired Lu Mao's character.
On his deathbed, Xu Hou left a will entrusting his children to Lu Mao.
Lu Mao treated them as if they were his own flesh and blood, ensuring they received a good education.
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