4 sentences

1. 他性格内向，平时不太爱说话。

   tā xìng​gé nèi​xiàng, píng​shí bù tài ài shuō​huà.

   He is introverted and usually doesn't talk much.

   Source: Dong Chinese Dictionary

2. 他性格内向，不喜欢与人交往。

   tā xìng​gé nèi​xiàng, bù xǐ​huan yǔ rén jiāo​wǎng.

   He is introverted and doesn't like socializing with people.

   Source: Dong Chinese Dictionary

3. 她性格内向，见到陌生人会感到害羞。

   tā xìng​gé nèi​xiàng, jiàn​dào mò​shēng​rén huì gǎn​dào hài​xiū.

   She is introverted and feels shy when meeting strangers.

   Source: Dong Chinese Dictionary

4. 这种内向型经济模式已经很难维持了。

   zhè zhǒng nèi​xiàng xíng jīng​jì mó​shì yǐ​jīng hěn nán wéi​chí le.

   This inward-looking economic model is already difficult to maintain.

   Source: Dong Chinese Dictionary