I don't understand "Sa sa ye la?" How could it mean "what is this?" Please, please explain.

Sa     |  sa   |   ye |  la    |  (contracted)

Kisa  |  sa   |   ye |  la    |  (uncontracted)

What |  that |   is   |  here |  (translation in English)

Thus,
Sa sa ye la? → What is that / this?

Sa sa yo ye la? → what are these/those?