3 sentences

1. 满意不是我的天性。

   mǎn​yì bù shì wǒ de tiān​xìng.

   Satisfaction is not in my nature.

   Source: OpenSubtitles

2. 孩子爱玩是天性。

   hái​zi ài wán shì tiān​xìng.

   It is in a child's nature to love playing.

   Source: Dong Chinese Dictionary

3. 吃人是你的天性。

   chī rén shì nǐ de tiān​xìng.

   It's your nature to eat people.

   Source: OpenSubtitles