yì​xìng HSK7

different nature

异性 (異性) yì​xìng
different nature noun
possessing different properties, characteristics, or qualities

In physics, opposite charges attract each other.

opposite sex noun
the opposite sex or relating to individuals of the other gender; heterosexual

He always feels very self-conscious in front of the opposite sex.

Frequency

Movie subtitles
10.9 per million appears in 3% of films
Written text
16.1 per million

Details

HSK 3.0
Level 7

Sources

Definitions
CC-CEDICT