2 sentences for 真性 (zhēn​xìng)

1. 医生确诊他患有真性近视，建议配戴眼镜。

   yī​shēng què​zhěn tā huàn​yǒu zhēn​xìng jìn​shì, jiàn​yì pèi​dài yǎn​jìng.

   The doctor diagnosed him with axial myopia and recommended wearing glasses.

   Source: Dong Chinese Dictionary

2. 只有在极端的情况下，一个人的真性才会显露出来。

   zhǐ​yǒu zài jí​duān de qíng​kuàng xià, yī​gè rén de zhēn​xìng cái huì xiǎn​lù chū​lái.

   Only in extreme situations does a person's true nature reveal itself.

   Source: Dong Chinese Dictionary