2 sentences for 异性 (yì​xìng — different nature)

1. 磁铁同性相斥，异性相吸。

   cí​tiě tóng​xìng xiāng​chì, yì​xìng xiāng xī.

   Like poles of a magnet repel each other, while opposite poles attract.

   Source: Dong Chinese Dictionary

2. 物理学中，异性电荷相互吸引。

   wù​lǐ​xué zhōng, yì​xìng diàn​hè xiāng​hù xī​yǐn.

   In physics, opposite charges attract each other.

   Source: Dong Chinese Dictionary