异性相吸
yì​xìng​xiāng​xī

opposites attract

异性相吸 (異性相吸) yì​xìng​xiāng​xī
opposites attract
the phenomenon where people of the opposite sex or with differing personalities are naturally drawn to one another
polar attraction
the physical principle that opposite polarities or electrical charges attract each other

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Definitions
CC-CEDICT