2 sentences for 性 (xìng — nature)

1. 他禀性刚强，从不向任何困难低头。

   tā bǐng xìng gāng​qiáng, cóng bù xiàng rèn​hé kùn​nan dī​tóu.

   He has a strong character and never bows to any difficulty.

   Source: Dong Chinese Dictionary

2. 这味药的性比较温和，适合在冬天用来调理身体。

   zhè wèi yào de xìng bǐ​jiào wēn​hé, shì​hé zài dōng​tiān yòng​lái tiáo​lǐ shēn​tǐ.

   This medicine is quite mild in nature and is suitable for conditioning the body in winter.

   Source: Dong Chinese Dictionary