2 sentences

1. 这件文物的出处目前还在调查中。

   zhè jiàn wén​wù de chū​chù mù​qián hái zài diào​chá zhōng.

   The origin of this artifact is still under investigation.

   Source: Dong Chinese Dictionary

2. 他的文章里，每一句引语都有明确的出处。

   tā de wén​zhāng lǐ, měi yī jù yǐn​yǔ dōu yǒu míng​què de chū​chù.

   In his article, every quote has a clear source.

   Source: Dong Chinese Dictionary