3 sentences

1. 我在室内抽烟呢。

   wǒ zài shì​nèi chōu yān ne.

   I'm smoking indoors.

   Source: OpenSubtitles

2. 让你的猫待在室内，注意变化。

   ràng nǐ de māo dāi zài shì​nèi, zhù​yì biàn​huà.

   Keep your cat indoors and watch for changes.

   Source: CCMatrix

3. 白天，我们大多数人留在室内工作。

   bái​tiān, wǒ​men dà​duō​shù rén liú zài shì​nèi gōng​zuò.

   During the day, most of us stay indoors to work.

   Source: CCMatrix