2 sentences

1. 建筑物内禁止吸烟。

   jiàn​zhù​wù nèi jìn​zhǐ xī​yān.

   Smoking is prohibited inside the building.

   Source: Dong Chinese Dictionary

2. 公共场所禁止吸烟。

   gōng​gòng chǎng​suǒ jìn​zhǐ xī​yān.

   Smoking is prohibited in public places.

   Source: Dong Chinese Dictionary